52671 + Interview Questions in Chemistry in Class 11

1.	Assertion: Al is used a reducing agent in the manufacture of Fe. Reason: Al can easily extract oxygen from iron oxide.
Answer» Both A and R ar true and R is the correct explanation of A Both A and R are true but R is not a correct explanation ofA A is true but R is false A is false but R is true Solution :Aluminium is not used for the MANUFACTURE of IRON as aluminium is more EXPENSIVE than iron.

Discussion

2.	Assertion: Al forms [AlF_6]^(3-)but B does not form [BF_6]^(3-) Reason: B does not react with fluorine.
Answer» If both assertion and reason are TRUE and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is FALSE. If both assertion and reason are false. Solution :B does not have vacant d-orbitals (sub-shell) as its VALENCE shell.

Discussion

3.	Assertion. Al and Ga have nearly same atomic radii. Reason. Al and Ga diagonal relationship.
Answer» If both assertion and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason not is the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false. Solution :CORRECT reason. DUE to INERT pair EFFECT, Al and Gahave nearly same atomic RADII.

Discussion

4.	Assertion. Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate AgBr rather than AgCl. Reason. K_(sp) of AgCl lt K_(sp)of AgBr.
Answer» If both assertion and reason are TRUE, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If aasertion is true, but reason is false. If both assertion and reason are false. Solution :Correct R. `K_(SP)` of `AgCl gt K_(sp)` of AGBR. For PRECIPITATION to OCCUR, ionic product should exceed solubility product.

Discussion

5.	Assertion. Addition of HI to vinyl chloride produces -chloro-1-todoethane Reason. HI adds to vinyl chloride against Markovnikov's rule
Answer» If both assertion and reason are TRUE, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct reason. HI adds to vinyl chloride ACCORDING to Markovnikov's RULE .

Discussion

6.	Assertion: Addition of HBr to propene yields 2-bromopropane but in presence of a peroxide it yields 1-bromopropane. Reason: When reaction is carried out in the presence of a peroxide it follows free radical mechanism, 2^(@) free radical is more stable than 1^(@) free radical.
Answer» If both ASSERTION and reson are TRUE and REASON is the correct EXPLANATION of assertion If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :

Discussion

7.	Assertion :Addition of bromine to trans-but-2-ene yields meso-2,3-dibromobutane.Reason : Bromine addition to an alkene is a nucleophilic addition (a)If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.(b) If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.(c) I Assertion is CORRECT but Reason is INCORRECT. (d)I Assertion is CORRECT but Reason is INCORRECT.
Answer» If both ASSERTION and Reason are CORRECT and Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion. I Assertion is CORRECT but Reason is INCORRECT. If Assertion is INCORRECT but Reason is CORRECT. Answer :C

Discussion

8.	Assertion. Addition of H_2O to acetylene occurs in presence of dil. H_2SO_4 and HgSO_4 to give acetaldehyde Reason It is an example of electrophilic addition reaction
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Answer :A

Discussion

9.	Assertion: Addition of Br_(2) to trans but-2-ene yields meso- 2,3-dibromobutane. Reason : Bromine addition to an alkene is an electrophilic addition reaction.
Answer» Assertion and reason both are CORRECT STATEMENTS and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion Assertion is correct statement but reason is WRONG statement. Assertion is wrong statement but reason is correct statement. Answer :B

Discussion

10.	Assertion : Acylation of benzene takes place in the presence of AlCl_(3) and CH_(3)COCl Reason : Acylation of benzene is electrophilic substitution process
Answer» Both A and R are TRUE is the correct EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true Answer :B

Discussion

11.	Assertion : Activity of 10^(8) undecayed radioactive nucei of half life 50 days is equal to that of 10 xx 10^(8) number of undecayed nuclei of some other material with half life 60 days. Reason : Activity is proportional to half life
Answer» Both A and R are true and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

12.	Assertion : Acid rain is harmful for agriculture, trees and plants. Reason: Acid rain dissolves and washer away nutrients needed for their growth.
Answer» Both ASSERTION and Reason are correct and the reason is the correct explanation for assertion. Both assertion and reason are correct, but the reason is not correct explanation of assertion. Both the assertion and reason are incorrect. The assertion is incorrect but the reason is correct. SOLUTION :The component and nutrients needed for the growth of agricultare, TREES and plants are dissolve in ACID rain thus, the growth is STOPPED. Thus, the acid rain is stopped. Thus, the acid rain is harmful for vegetation.

Discussion

13.	Assertion. Acetylene reacts with sodamide te evolve H_2 gas Reason. Acetylene is a weaker acid than ammonia
Answer» If both ASSERTION and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct assertion. Acetylene REACTS with sodamide to EVOLVE `NH_3`, i.e., `HC-=CH+NaNH_2 to HC-=CN a +NH_3` Correct reason. Acetylene is a STRONGER acid than ammonia.

Discussion

14.	Assertion. Acidity of the C-H bond decreases in the order: HC-=CH gt H_2C =CH_2 gt CH_3 -CH_3 Reason. Acidity of the C-H bond increases as the electronegativity of the carbon to which it is attached increases
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Answer :A

Discussion

15.	Assertion. Acetylene on treating with NaNH_2, gives sodium acetylide and ammonia Reaction. sp-Hybridized carbon atoms of acetylene are considerably electronegative.
Answer» If both ASSERTION and REASON are true, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct explanation. ACETYLENE is a stronger acid than ammonia.

Discussion

16.	Statement I: Acetic acid deviates from ideal behaviour. Statement II: Acetic acid exists as a dimer by forming inter molecular hydrogen bonds and hence deviates from Raoult's law.
Answer» Assertion and REASON are correct and R is the correct explanation of A. Both A and R are correct R is not the correct explanation of A. A is correct but R is wrong A is wrong but R is correct Answer :B

Discussion

17.	Assertion : Acetic acid is a weak acid. Reason : It has weak conjugate base.
Answer» if both assertion and reason are CORRECT and reason is CORRECTEXPLANATION for assertion. if both assertion and reason are correct but reason is not correct EXPLANATION for assertion. if assertion is correct but reason is incorrect. if assertion and reason boht are incorrect. Solution :Correct reason . It has a STRONG conjugate base.

Discussion

18.	Assertion : Acetic acid does not undergo haloform reaction. Reason : Acetic acid does not have any alpha- H atom
Answer» Both A and R are true is the correct EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :C

Discussion

19.	Assertion. According to Thomson model of atom, mass of the atom is concentrated in the centre of the atom. Reason. According to Thomson model, positive charge is concentrated in the centre of the atom
Answer» If both assertion and reason are true, and reason is the true explanation of the arrertion If both assertion and reason are true, but reason is not the true explanation of the assertional If assertion is true, but reason is false If both assertion and reason are false Solution :Correct A. According to Thomson MODEL of ATOM, MASS of the atom is uniformly distributed over the atom. Correct R. According to Thomosn model, positive charge is uniformly distributed over the atom.

Discussion

20.	Assertion :Absorption spectrum conists of some bright lines separated by dark spaces . Reason : Emission spectrum consists of dark lines
Answer» If both assertion and reason are true and the reason is the CORRECT explanation of the assertion If both assertion and reason are true butreason isnot the correct explanation of the assertion If assertion is true but reason is FALSE If the assertion and reason both are false Solution :We know that Absorption spectrum is produced when white light is passed through a substance and transmitted light is ANALYSED by a spectrograph. The dark SPACES corresponds to the light radiation absorbed by the substance. And emission spectrum is produced by ANALYSING the radiant energy emitted by an excited substance by a spectrograph. Thus discontinuous spectra consisting of a series of sharp lines and separated by dark bands are obtained . Therefore both the Assertion and Reason are false.

Discussion

21.	Assertion (A):Among isomeric pentanes, 2,2-dimethylpentane has the highest boiling point. Reason(R): Branching does not affect the boiling point.
Answer» Both ASSERTION and Reason are correct and REASONIS the correct explanation of Assertion. Both Assertion and Reason are correct butReasonisnot the correct explanation of Assertion. Both Assertion and Reason are not correct Assertion is not correct but Reason is correct. Solution :Correct Assertion. Among isomeric pentanes, 2,2-dimethylpentane has the LOWEST boiling point. Correct Reason . BRANCHING decreases the boiling point.

Discussion

22.	Assertion : is called cyclohexane nitrile. Reason: It contains six carbone atoms in the ring and -CN as the functional group.
Answer» If both assertion and reason are TRUE and the reason is the CORRECT explanation of the assertion. If both the assertion and reason are true but the reason is not the correct explanation of assertion. If the assertion is true but reason is false. If assertion is false but reason is true. ANSWER :d

Discussion

23.	Assertion (A): Zinc metal when placed in copper sulphate solution, zinc turns brown. Reason (R): Due to metal displacement reaction, copper sulphate reacts with zinc, Cu gets deposited over zinc and so it turns brown.
Answer» Both (A) and (R) are CORRECT but (R) is not the correct EXPLANATION of (A) Both (A) and (R) are correct and (R) is the correct explanation of (A). (A) is correct but (R) is WRONG. (A) is wrong but (R) is correct Answer :A

Discussion

24.	Assertion (A) : When two non-reactive gases are allowed to mix, the gas molecules migrate from region of higher concetration to a region of lower concentration. Reason (R) : The property of gas which involves the movement of the gas molecules through another gases is called Effusion.
Answer» Bothe (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A). Both (A) and (R) are true and (R)is not the correct explanation of (A). (A) true but (R) false. Both (A) and (R) are false. Answer :C

Discussion

25.	Assertion (A) : When freshly precipitated nickel sulphide (NiS) is shaken with a solution of hydrogen sulphide, a colloidal sol. is obtained . Reason (R): The cause of peptization is the development of positive or negative charge on the precipitates by selective adsorption of ions from electrolytes.
Answer» Both A and R are TRUE and R is the correct explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

26.	Assertion (A) water destryos grignardreagent and so it is not used as solvent for RmHx Reason(R ): waterdecomposes grignardreagent (RMGX) to givealkane
Answer» both a and R are correct and r is the correct explanation of a both a and r are correct but r is not the correct explanation OFA a sicorrectbut r is wrong a is worng but r is correct ANSWER :a

Discussion

27.	Assertion (A): UV radiations damages the fish productivity Reason (R): UV radiations affect the growth of phytoplanktons as a result food chain in ocean is disturbed.
Answer» Both (A) and (R) are CORRECT and (R)is the correct EXPLANATION of (A). Both (A) and (R) are correct but (R) is not the correct explanation of (R). (A) is correct but (R) is WRONG. (A) is wrong but (R) is correct. SOLUTION :Both (A) and (R) are correct but (R) is not the correct explanation of (R).

Discussion

28.	Assertion (A): UV radiations damages the fish productivity.Reason (R): UV radiations affect the growth of phytoplanktons as a result food chain in ocean is disturbed.
Answer» Both (A) and (R) are CORRECT but (R) is not the correct EXPLANATION of (A). Both (A) and (R) are correct and (R) is the correct explanation of (A). (A) is correct but (R) is WRONG. (A) is wrong but (R) is correct. Solution :Both (A) and (R) are correct and (R) is the correct explanation of (A).

Discussion

29.	Assertion (A) underset(CH)overset(C)("\|\|\|")+2Lioverset(NH_(3)(i))rarrunderset(CLi)overset(CLi)("\|\|\|")+H_(2)Reasons (A) Alkali metals form acetylides with terminal alkynes.
Answer» SOLUTION :LI does not FORM ACETYLIDES.

Discussion

30.	Assertion (A) : Trister of glycerol and palmitic acid on boiling with aqueous NaOH gives a solid cake having soapy touch. Reason (R) : Free glycerol is libreated during the reaction with a greasy solid.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A. Both A and R are true and R is not a correct explanation of A. A is true but R is FALSE. A is false but R is true. Answer :C

Discussion

31.	Assertion (A) : Toluene on Friedel Crafts methylation gives o- and p- xylene. Reason (R): CH_3-group bonded to benzene ring increases electron density at o- and p- position.
Answer» Both ASSERTION and Reason are correct and REASONIS the correct explanation of Assertion. Both Assertion and Reason are correct butReasonisnot the correct explanation of Assertion. Both Assertion and Reason are not correct Assertion is not correct but Reason is correct. SOLUTION :Both Assertion and Reason are correct and Reasonis the correct explanation of Assertion.

Discussion

32.	Assertion (A) : Tl(OH)_(3) is more basic than TlOH. Reason (R) : It can be explained on the basis of Fajan's rule.
Answer» Both A and R are true and R is the correct explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Solution :Assertion. `Tl(OH)_(3)` is less BASIC than `TlOH`.

Discussion

33.	Assertion (A) : Toluene on Friedal Crafts methylation gives o-and p-xylene. Reason (R) : CH_(3) group bonded to benzene ring increases electron density at o-and p-position.
Answer» Both A and R are correct and R is the correct explanation of A. Both A and R are correct and R is not the correct explanation of A. Both A and R are not correct. A is not correct but R is correct. Solution :Toluene has `-CH_(3)` group ATTACHED to benzene RING. `CH_(30` group is electron withdrawing group which activates benzene ring due to hyper-conjugation effect, and increases electron density on ortho and parapositions for the attack of electrophiles.

Discussion

34.	Assertion (A) : Tl^(3+) acts as an oxidising agent. Reason (R) : Due to inert pair effect Tl^(+) is more stable than Tl^(3+).
Answer» Both A and R are true and R is the correct explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true Solution :Both assertion and reason are correct.

Discussion

35.	Assertion (A) : Three states of matter are the result ofbalance between intermolecular forces and thermal energy of the molecules. Reason(R ) : Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A. Both A and R are true R is not the correct explanation of A. A is true but R is false. A is false but R is true. ANSWER :A

Discussion

36.	Assertion (A) : Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.Reason (R ) : Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.
Answer» Both A and R are true and R is the CORRECT explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false. A is false but R is true. Solution :Both assertion and reason are true and reason is the correct explanation of assertion. Intermolecular forces and thermal energy DECIDES the state of MATTER as the former kept the MOLECULES together but after some time, it KEEPS them apart.

Discussion

37.	Assertion (A) : Though the central atom of both NH_(3) and H_(2)Omolecules are sp^(3) hybridised , yet H-N-H bond angle is greater than that of H-O-H.
Answer» A and R both are CORRECT, and R is the correct ecplanation of A. A and R both are correct, But R is not the correct ecplanation of A . A is TRUE but R is FALSE . A and R both are false. ANSWER :A

Discussion

38.	Assertion (A) : Thhe compound called inorganic benzene s borazine. Reason (R) :Borazine has a structure similar to benzene.
Answer» Both A and R are TRUE and R is the CORRECT explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true Solution :Both assertion and reason are correct.

Discussion

39.	Assertion (A) : Though the central atom of both NH_(3) and H_(2)O molecules are sp^(3) hybridised, yet H - N - H bond angle is greater than that of H- 0 - H. Reason (R) : This is because nitrogen atom has one lone pair and oxygen atom has two lone pans.
Answer» A and R both are CORRECT, and R is the correct explanation of A. A and R both are correct, but R is not the : correct explanation of A. A is true but R is false. A and R both are false. SOLUTION :A Assertion and REASON both are correct and reason is the correct explanation of assertion

Discussion

40.	Assertion (A): There are three hyperconjugration structure of ethyl cation CH_(3) overset(+)(C )H_(2). Reason (R ): Ethyl cation CH_(3) overset(+)(C )H_(2) is a carbocation
Answer» Statement (A) and REASON (R ) both are right. Statement (R ) is correct explanation of statement (A) Statement (A) and Reason (R ) both are right, but (R ) is not correct explanation of statement (A) Both Statement (A) and (R ) are wrong Statement (A) is right but statement (R ) is wrong Solution :Assertion (A) is correct because the three hyperconjugation structure of `CH_(3)CH_(2)^(+)` are as under `H= underset(underset(H)(\|))OVERSET(overset(H)(\|))(C )- underset(underset(H)(\|))overset(oplus)(C )-H harr underset((I))(H- underset(underset(H)(\|))overset(overset(oplus)(H))(C )= underset(underset(H)(\|))(C )-H) harr underset((II))(overset(oplus)(H) underset(underset(H)(\|))overset(overset(H)(\|))(C )-= underset(underset(H)(\|))(C )- H) harr underset((III))(H- underset(H^(oplus))overset(overset(overset(oplus)(H))(\|))(C )= underset(underset(H)(\|))(C )-H)` `CH_(3) overset(+)(C )H_(2)` is a carbocation. so it is correct. Because the positive charge is present in carbon of `CH_(2)`. Correct reason: In addcont POSITION of `overset(+)(C )H_(2) CH_(3)` group is than in which three C-H bond present in which three hyperconjugation structure are possible

Discussion

41.	Assertion (A) : The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature. Reason (R ) : At high altitude, atmospheric pressure is high.
Answer» Both A and R are TRUE and R is the correct explanation of A. Both A and R are true R is not the correct explanation of A. A is true but R is FALSE. A is false but R is true. Solution :Correct R. At high altitude, atmospheric pressure is LOW.

Discussion

42.	Assertion (A) : The temperature in the thermosphere increases with altitude. Reason (R) : Ozone present in stratosphere absorbs ultraviolet radiation
Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is false Both (A) and (R) are false Answer :B

Discussion

43.	Assertion (A) : The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature. Reason (R ) : At high altituded atmospheric pressure is high.
Answer» Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false. A is false but R is true. Solution :Assertion is true but REASON is false. At HIGH ALTITUDE, atmospheric pressure is low.

Discussion

44.	Assertion (A) : The structure of water is 'V' shaped while that of the Carbon dioxide is linear . Reason (R ) : It can be answered using the principles of chemical bonding .
Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of(A). Both (A) and (R ) are true and (R ) is not the correct explanation of (A). (A) true but (R ) true. Both (A) and (R ) are false. Answer :a

Discussion

45.	Assertion (A) The reaction LiI + KF rarr LiF + KI proceed in the direction indicated. Reasons (A) Fluorine, being more reactive can easily replace iodine.
Answer» Solution :Reason. LARGE CATION stabilises LARGER ANION.

Discussion

46.	Assertion (A): The purification of aniline is done by steam distillation Reason (R ): The distillation of aniline is not done
Answer» STATEMENT (A) and Reason (R ) both are RIGHT. Statement (R ) is correct explanation of statement (A) Statement (A) and Reason (R ) both are right, but (R ) is not correct explanation of statement (A) Both Statement (A) and (R ) are wrong Statement (A) is right but statement (R ) is wrong Solution :The distillation and steam distillation also POSSIBLE in aniline. Aniline is immiscible in water and aniline undergo steam distillation, due to this reason to GET PURE aniline steam distillation is carried out

Discussion

47.	Assertion (A): The pH of acid rain is less than 5.6. Reason (R): CO_2 present in the atmosphere dissolves in rain water and forms carbonic acid.
Answer» Both (A) and (R) are CORRECT and (R)is the correct EXPLANATION of (A). Both (A) and (R) are correct but (R) is not the correct explanation of (R). (A) is correct but (R) is WRONG. (A) is wrong but (R) is correct. SOLUTION :Both (A) and (R) are correct and (R)is the correct explanation of (A).

Discussion

48.	Assertion (A): The pH of acid rain is less than 5.6 Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.
Answer» Both Assertion and Reason are CORRECT and is the correct explanation of Assertion Both Assertion and Reason are correct but Reasonis not the correct explanation of Assertion Both Assertion and Reason are not correct Assertion is not correct but Reason is correct Solution :CorrectExplanation. `CO_2` as well as OXIDES of nitrogen and SULPHUR DISSOLVE in water to form ACID rain which has pH lt 5.6

Discussion

49.	Assertion (A) : The pH of acid rain is less than 5.6. Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.
Answer» Both (A) and (R) are correct and (R) is the correct explanation of (A). Both (A) and (R) are correct but (R) is not the correct explanation of (A). Both (A) and (R) are not correct. (A) is not correct but R is correct. Solution :Due to the PRESENCE of `H^+` ions formed by the reaction of rain water with carbon dioxide PRESENT in the atmosphere, pH of rain water is a 5.6. `H_2 O_((l)) + CO_(2(g)) to H_2 CO_(3(AQ))` `H_2 CO_(3(aq)) hArr H_((aq))^+ to HCO_(3(aq))` When the pH of rain water DROPS below 5.6 it is called acid rain.

Discussion

50.	Assertion (A): The pH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8 (pK_(a) of acetic acid is 4.8). Reasons (R): The ionic product of water at 25^(circ)C is 10^(-14) mol^(2)L^(-2).The correct answer is
Answer» <P>Both (A ) and (R ) are true and (R )is the correct explanation of (A ) Both (A) and (R ) are true and (R )is not the correct explanation of (A) (A ) is true but (R ) is FALSE (A ) is false but (R ) is true Solution :`P^(H)= PK a +log "" (S)/(A)=PKA (because S = A ) `

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion: Al is used a reducing agent in the manufacture of Fe. Reason: Al can easily extract oxygen from iron oxide.

Assertion: Al forms [AlF_6]^(3-)but B does not form [BF_6]^(3-) Reason: B does not react with fluorine.

Assertion. Al and Ga have nearly same atomic radii. Reason. Al and Ga diagonal relationship.

Assertion. Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate AgBr rather than AgCl. Reason. K_(sp) of AgCl lt K_(sp)of AgBr.

Assertion. Addition of HI to vinyl chloride produces -chloro-1-todoethane Reason. HI adds to vinyl chloride against Markovnikov's rule

Assertion: Addition of HBr to propene yields 2-bromopropane but in presence of a peroxide it yields 1-bromopropane. Reason: When reaction is carried out in the presence of a peroxide it follows free radical mechanism, 2^(@) free radical is more stable than 1^(@) free radical.

Assertion. Addition of H_2O to acetylene occurs in presence of dil. H_2SO_4 and HgSO_4 to give acetaldehyde Reason It is an example of electrophilic addition reaction

Assertion: Addition of Br_(2) to trans but-2-ene yields meso- 2,3-dibromobutane. Reason : Bromine addition to an alkene is an electrophilic addition reaction.

Assertion : Acylation of benzene takes place in the presence of AlCl_(3) and CH_(3)COCl Reason : Acylation of benzene is electrophilic substitution process

Assertion : Activity of 10^(8) undecayed radioactive nucei of half life 50 days is equal to that of 10 xx 10^(8) number of undecayed nuclei of some other material with half life 60 days. Reason : Activity is proportional to half life

Assertion : Acid rain is harmful for agriculture, trees and plants. Reason: Acid rain dissolves and washer away nutrients needed for their growth.

Assertion. Acetylene reacts with sodamide te evolve H_2 gas Reason. Acetylene is a weaker acid than ammonia

Assertion. Acidity of the C-H bond decreases in the order: HC-=CH gt H_2C =CH_2 gt CH_3 -CH_3 Reason. Acidity of the C-H bond increases as the electronegativity of the carbon to which it is attached increases

Assertion. Acetylene on treating with NaNH_2, gives sodium acetylide and ammonia Reaction. sp-Hybridized carbon atoms of acetylene are considerably electronegative.

Statement I: Acetic acid deviates from ideal behaviour. Statement II: Acetic acid exists as a dimer by forming inter molecular hydrogen bonds and hence deviates from Raoult's law.

Assertion : Acetic acid is a weak acid. Reason : It has weak conjugate base.

Assertion : Acetic acid does not undergo haloform reaction. Reason : Acetic acid does not have any alpha- H atom

Assertion. According to Thomson model of atom, mass of the atom is concentrated in the centre of the atom. Reason. According to Thomson model, positive charge is concentrated in the centre of the atom

Assertion :Absorption spectrum conists of some bright lines separated by dark spaces . Reason : Emission spectrum consists of dark lines

Assertion (A):Among isomeric pentanes, 2,2-dimethylpentane has the highest boiling point. Reason(R): Branching does not affect the boiling point.

Assertion : is called cyclohexane nitrile. Reason: It contains six carbone atoms in the ring and -CN as the functional group.

Assertion (A): Zinc metal when placed in copper sulphate solution, zinc turns brown. Reason (R): Due to metal displacement reaction, copper sulphate reacts with zinc, Cu gets deposited over zinc and so it turns brown.

Assertion (A) : When two non-reactive gases are allowed to mix, the gas molecules migrate from region of higher concetration to a region of lower concentration. Reason (R) : The property of gas which involves the movement of the gas molecules through another gases is called Effusion.

Assertion (A) water destryos grignardreagent and so it is not used as solvent for RmHx Reason(R ): waterdecomposes grignardreagent (RMGX) to givealkane

Assertion (A): UV radiations damages the fish productivity Reason (R): UV radiations affect the growth of phytoplanktons as a result food chain in ocean is disturbed.

Assertion (A): UV radiations damages the fish productivity.Reason (R): UV radiations affect the growth of phytoplanktons as a result food chain in ocean is disturbed.

Assertion (A) underset(CH)overset(C)("|||")+2Lioverset(NH_(3)(i))rarrunderset(CLi)overset(CLi)("|||")+H_(2)Reasons (A) Alkali metals form acetylides with terminal alkynes.

Assertion (A) : Trister of glycerol and palmitic acid on boiling with aqueous NaOH gives a solid cake having soapy touch. Reason (R) : Free glycerol is libreated during the reaction with a greasy solid.

Assertion (A) : Toluene on Friedel Crafts methylation gives o- and p- xylene. Reason (R): CH_3-group bonded to benzene ring increases electron density at o- and p- position.

Assertion (A) : Tl(OH)_(3) is more basic than TlOH. Reason (R) : It can be explained on the basis of Fajan's rule.

Assertion (A) : Toluene on Friedal Crafts methylation gives o-and p-xylene. Reason (R) : CH_(3) group bonded to benzene ring increases electron density at o-and p-position.

Assertion (A) : Tl^(3+) acts as an oxidising agent. Reason (R) : Due to inert pair effect Tl^(+) is more stable than Tl^(3+).

Assertion (A) : Three states of matter are the result ofbalance between intermolecular forces and thermal energy of the molecules. Reason(R ) : Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.

Assertion (A) : Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.Reason (R ) : Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.

Assertion (A) : Though the central atom of both NH_(3) and H_(2)Omolecules are sp^(3) hybridised , yet H-N-H bond angle is greater than that of H-O-H.

Assertion (A) : Thhe compound called inorganic benzene s borazine. Reason (R) :Borazine has a structure similar to benzene.

Assertion (A) : Though the central atom of both NH_(3) and H_(2)O molecules are sp^(3) hybridised, yet H - N - H bond angle is greater than that of H- 0 - H. Reason (R) : This is because nitrogen atom has one lone pair and oxygen atom has two lone pans.

Assertion (A): There are three hyperconjugration structure of ethyl cation CH_(3) overset(+)(C )H_(2). Reason (R ): Ethyl cation CH_(3) overset(+)(C )H_(2) is a carbocation

Assertion (A) : The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature. Reason (R ) : At high altitude, atmospheric pressure is high.

Assertion (A) : The temperature in the thermosphere increases with altitude. Reason (R) : Ozone present in stratosphere absorbs ultraviolet radiation

Assertion (A) : The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature. Reason (R ) : At high altituded atmospheric pressure is high.

Assertion (A) : The structure of water is 'V' shaped while that of the Carbon dioxide is linear . Reason (R ) : It can be answered using the principles of chemical bonding .

Assertion (A) The reaction LiI + KF rarr LiF + KI proceed in the direction indicated. Reasons (A) Fluorine, being more reactive can easily replace iodine.

Assertion (A): The purification of aniline is done by steam distillation Reason (R ): The distillation of aniline is not done

Assertion (A): The pH of acid rain is less than 5.6. Reason (R): CO_2 present in the atmosphere dissolves in rain water and forms carbonic acid.

Assertion (A): The pH of acid rain is less than 5.6 Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.

Assertion (A) : The pH of acid rain is less than 5.6. Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.

Assertion (A): The pH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8 (pK_(a) of acetic acid is 4.8). Reasons (R): The ionic product of water at 25^(circ)C is 10^(-14) mol^(2)L^(-2).The correct answer is