52671 + Interview Questions in Chemistry in Class 11

1.	Assertion. At same temperature, most probable speed of N_(2) is greater than that of Cl_(2). Reason. At the same temperature, fraction of N_(2) molecules possessing the most probable slope speed is greater than that of Cl_(2) molecules.
Answer» SOLUTION :Correct R. At the same temperature, fractionof `N_(2)` molecules POSSESSING the most PROBABLE speed is less than that of `Cl_(2)` molecules

Discussion

2.	Assertion : At zero degree kelvin, the volume occupied by a gas is negligible. Reason : All molecular motion ceases at 0 K.
Answer» If both assertion and reason are CORRECT and reason is correct explanation for assertion If both assertion and reason are correct and reason is not correct explanation for assertion If assertion is correct but reason is incorrect If assertion and reason are both incorreect. Solution :Correct reason : Every GAS changes to liquid states before attaining this TEMPERATURE.

Discussion

3.	Assertion : At least one radioactive isotope of every element has been prepared in the laboratory. Reason : The bombardment of various atomic nuclei with common light weight projectile lead to artificial radioactivity.
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

4.	Assertion. At high pressure, the compressibility factor Z is (1+(Pb)/(RT)). Reason. At high pressure, van der Waals equation is modified as P(V-b)=RT.
Answer» SOLUTION :R is the CORRECT EXPLANATION of A

Discussion

5.	Assertion : At high altitudes , liquids boil at lower temperatures in comparison to that at sea level .Reason : At high altitudes , atmospheric pressure is low .
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 NOTTHE correct explanation of assertion . If assertion is true but reason is false . If both assertion and reason are false . Answer :A

Discussion

6.	Assertion : At constant temperature, pV vs V plot for real gases is not a straight line. Reason : At high pressure all gases have Z gt 1 but at intermediate pressure most gases have Z lt 1.
Answer» A and R both are CORRECT, and R is correct EXPLANATION of A. A and R both are correct, but R is not correct explanation of A. A is TRUE but R is false. A is false but R is true. Answer :B

Discussion

7.	Assertion : At constant temperature PV vs P plot for real gases is not a straight line .Reason : In the curves of dihydrogen and helium , as the pressure increases the value of PV also increases .
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 notthe correct explanation of assertion . If assertion is true but reason is false . If both assertion and reason are false . Solution :PV `vs` P PLOT for real GASES is not a straight line because real gases do not follow IDEAL gas EQUATION perfectly under all conditions.

Discussion

8.	Assertion : At constant pressure, the volume of a given mass of a gas is inversely proportional to its absolute temperature. Reason : At absolute zero, the volume of a gas reduces to zero.
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. If Assertion is CORRECT but Reason is INCORRECT. If Assertion is INCORRECT but Reason is CORRECT. Solution :If Assertion is INCORRECT but Reason is CORRECT.

Discussion

9.	Assertion. At 298 K and 1 atm pressure, solids do not have any entropy but liquids and gases have definite values of entropy. Reason . At 298 K and 1 atm pressure, particle in a solid are fixed and do not have translatory, rotatory or vibraory motion whereas in liquids and gases, molecules have all the three types of motion.
Answer» If both A and R are true,andR is the trueexplanation of A. If both A and R are true,but R is not the true explanation of A. If A is true, but R is false If both A and R are false. Answer :d

Discussion

10.	Assertion. Aqueous solution of ammonium carbonate is basic. Reason. Acidic or basic nature of a salt solution depends upon K_(a) and K_(b)value of acid and base forming the salt.
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 :R is the CORRECT explanation of A.

Discussion

11.	Assertion. Antiferromagnetic substances on heating to high temperature become paramagnetic . Reason. On heating, randomisation of spins occurs.
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 :R is correct explanation of A

Discussion

12.	Assertion Antiferromagnetic substances can be made paramagnetic by heating. Reason(R)On heating some of theions changetheir direction of spin.
Answer» Both A and R are true and R is THECORRECT explanation of A Both A ANDR 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

13.	Assertion. Antiferromagnetic substance on heating temperature become paramagnetic. Raason. On heating, randomisation of spins occurs.
Answer» SOLUTION :R is the CORRECT EXPLANATION of A.

Discussion

14.	Assertion : An orbital cannot have more than two electrons, moreover, if an orbital has two electrons they must have opposite spins.Reason : No two electrons in an atom can have same set of all the four quantum numbers.
Answer» If both ASSERTION & Reason are TRUE and the reason is the correct explanation of the assertion. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. If Assertion is true STATEMENT but Reason is false. If both Assertion and Reason are false statements. Answer :A

Discussion

15.	Assertion : An ideal solution obeys Raoults Law Reason: In an ideal solution , solvent-solvent as well assolute-solute interactins are similarto solute-solvent interactions.
Answer» Both assertion and reason are TRUE and reason is the CORRECT EXPLANATION of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion assertion is true but reason is FALSE both assertion and reason are false Answer :A

Discussion

16.	Assertion : An element that has a fractional atomic mass. Reason : An element exist an isotope.
Answer» Both ASSERTION and REASON are correct and reason is the correct EXPLANATION for assertion. Both assertion and reason are correct but reason is not the correct explanation for assertion Assertion is TRUE but reason are false. Both assertion and reason are false Answer :A::B::C::D

Discussion

17.	Assertion. An aqueous solution of ammonium acetate can act as buffer. Reason. An aqueous solution of any pure salt acts as a buffer.
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. An AQUEOUS solution of a SALT of WEAK acid and weak base acts as BUFFER.

Discussion

18.	Assertion Amorphous solids are isotropic. Reason(R)Amorphous solids do not possess rigidity.
Answer» Both A and R are TRUE and R is THECORRECT explanation of A Both A andR 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 . Among the alkali metals , lithium salts exhibit the least electrical conductance in aqueous solutions . Reason . Smaller the radius of the hydrated cation , lower is the electrical conductance in aqueous solutions .
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 . Among alkali metals , the extent of hydration decreases as the size of the cation increases from `LI^(+)` to `Cs^(+)` . In other words , `Li^(+)` ions are most highly HYDRATED (i.e., have the largest size) and HENCE their ionic mobility , i.e., conductance is the least among alkali metals .

Discussion

20.	Assertion :Among SiCl_4and C Cl_4 only SiCl_4 reacts with water. Reason : SiCl_4 is ionic and C Cl_4 is covalent .
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. If Assertion is Correct but Reason is Incorrect If Assertion is incorrect but Reason is Correct Answer :C

Discussion

21.	Assertion : Among H_(2)^(-),He,He^(+), He^(2+), H_(2)^(-) has the largest their parent atoms.
Answer» if both the ASSERTION and REASON are true and reason is true 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 if false but reason is true. Solution :Both assertion and reason are true and the reason is the correct explanation of the assertion.

Discussion

22.	Assertion : Ammonia reacts with water does not obey Henry's law. Reason : The gases reacting with the solvent does not obey Henry's law.
Answer» 1) ASSERTION and Reason are correct and R is the correct explanation of A. 2) Both A and R are correct R is not the correct explanation of A. 3) A is correct but R is wrong 4) A is wrong but R is correct Answer :A

Discussion

23.	Assertion : Amides react with Br_(2) + KOH to give 1^(@) amine with one carbon less than parent atom Reason : The reaction occurs through a carbene intermediate
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

24.	Assertion: Although the ionisation energy of iodine (1008 kJ mol) is much lower than that of hydrogen (1310 kJ mol^(-1)), yet, compounds of I^+ cation are very less. Reason: Iodine is electronegative element and hence cannot form compounds in positive oxidation states.
Answer» Both A and B TRUE and R is the correct EXPLANATION 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

25.	Assertion : Although aluminium is above hydrogen in electrochemical series, it is stable in air and water. Reason : The thin protective layer of oxide (AI_(2) O_(3)) on the surface protects the aluminium.
Answer» ANSWER :A

Discussion

26.	Assertion : alpha-particles are generally used as projectiles for transformation Reason : alpha-particles always experience repulsion from the positively charged nucleus.
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 :D

Discussion

27.	Assertion : All the three isotope of hydrogen have almost the same chemical properties. Reason : Isotopes differ from one another in respect of the presence of neutrons.
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 :ISOTOPES have almost the same CHEMICAL properties because they have the same ELECTRONIC configuration.

Discussion

28.	Assertion : All the gases should be cooled below their critical temperature for liquification .Reason : Cooling slows down the movement of molecules therefore , intermolecular forces may hold the slowly moving molecules together and the gas liquifies .
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 notthe correct explanation of assertion . If assertion is true but reason is false . If both assertion and reason are false . Solution :Critical temperature of a GAS is the highest temperature at which liquification of the gas FIRST occurs.Above critical temperature, gas cannot be LIQUEFIED howsoever high pressure may be APPLIED on the gas.

Discussion

29.	Assertion : Allyl free radical is more stable than simple alkyl free radical. Reason : The allyl free radical is stabilized by resonance.
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

30.	Assertion : All the carbon atoms of but-2-ene lie in one plane. Reason : All the carbon atoms in but-2-ene are sp^(2)-hybridized.
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 : Only the carbon ATOMS of the double bond in but-2-ene are `sp^(2)` hybridized.

Discussion

31.	Assertion (A) : All the C atoms of but-2-ene lie in one plane Reason (R ): Double-bond C atoms are sp^(2)-hypbridised.
Answer» If both assertion and reason are correct and REASONIS crect explanation for assertion If both assertion and reason are correct but reasonis not COTTECT explanation for assertion If reason is correct but assertion is incorrect If both assertion and reason are incorrect Answer :c

Discussion

32.	Assertion : All the carbon atoms of but-2-ene lie in one plane. Reason : All the carbon atoms in but-2-ene are sp^(2) hybridized.
Answer» If both assertion and reason are correct and reason is correct EXPLANATION 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 both assertion and reason are incorrect. Solution :Correct reason : Only the CARBON atoms involved in double BOND are `SP^(2)` hydridised.

Discussion

33.	Assertion. All isotopes of a given element show the same type of chemical behaviour Reason. The chemical properties of an atom are controlled by the number of electrons in an 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 :R is the correct explanation of A

Discussion

34.	Assertion : All halogens undergo disproportionation reaction in alkaline medium. Reason : All halogens exhibit variable oxidation states.
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 :`Cl_(2),Br_(2)` and `I_(2)` undergo disproportionation reaction whereas fluorine does not undergo disproportionation being the most electronegative element. Fluorine cannot exhibit POSITIVE OXIDATION state and HENCE does not show disproportionation tendency. Fluorine can exhibit only - I oxidation state.

Discussion

35.	Assertion. Alkynes are more reactive towards nucleophilic addition reaction as compared to alkenes Reason. Alkynes contain two pi bonds, while alkenes have only one pi bond
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. Since sp-hybridized carbon in alkynes is more electronegative than `sp^2`-hybridized carbon in alkenes , THEREFORE, nucleophiles can ATTACK sp-hybridizedcarbon more easily than `sp^2`-carbon in alkenes.

Discussion

36.	Assertion :Alkynes are less reactive than alkenes towards electrophilic reagentsReason :General formula of alkenes is CnH2n-2a.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. Assertion is CORRECT but Reason is INCORRECT.d.If Assertion is INCORRECT but Reason is CORRECT.
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 :B

Discussion

37.	Assertion. Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene. Reason. Alkyl halides are less reactive than acyl halides.
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. DUE to +I - effect to the alkyl group, ELECTRON DENSITY increases in alkylbenzene relative to BENZENE and hence further substitution OCCURS to form a poly alkyl substituted benzene.

Discussion

38.	Assertion: Alkyl iodide can be prepared by treating alkyl chloride/bromide with Nal in acetone. Reason : NaCl and NaBr are soluble in acetone but Nal is not.
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 :C

Discussion

39.	Assertion : Alkyl carbanion like ammonia have pyramidal shape. Reason : The carbon atom carrying negative charge has an octet of electrons.
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. DUE to greater lp-bp over bp-bp repulsions, carbanions assume PYRAMIDAL SHAPE.

Discussion

40.	Assertion: Alkyl carbonaions like ammonia have pyramidal shape. Reason: The carbon carrying negative charge has an octet of electrons.
Answer» If both ASSERTION and REASON are correct and REASONIS crect EXPLANATION for assertion If both assertion and reason are correct but reasonis not cottect explanation for assertion If reason is correct but assertion is incorrect If both assertion and reason are incorrect Answer :B

Discussion

41.	Assertion : Alkyl carbanions like ammonia have pyramidal shape. Reason : The carbon atom carrying negative charge has an octet of electrons.
Answer» If both ASSERTION and reason are correct and reason is correct explanation 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 both assertion and reason are incorrect. Solution :Corrrect explanation : Alkyl carbonions assume pyramidal STRUCTURE due to presence of LONE pair responsible for negative charge on the carbon ATOM.

Discussion

42.	Assertion: Alkenes are easily attacked by electrophilic reagents. Reason: Alkenes are unstable molecules in comparison to alkenes.
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 :The PRESENCE of WEAKER `pi` bond MAKES alkene source of loosely held mobile electrons.

Discussion

43.	Assertion : Alkenes having more than three carbon atoms exhibit chain isomerism. Reason : All carbon atoms in alkanes are sp-hybridized.
Answer» If both assertion and reason are correct and reason is correct explanation 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 both assertion and reason are incorrect. Solution :Correct reason : A minimum of FOUR carbon ATOMS in necessary if a compound is to EXHIBIT chain ISOMERISM.

Discussion

44.	Assertion :Alkanes having more than three carbon atoms exhibit chain isomerism. Reason : All carbon atoms in alkanes are sp-hybridized
Answer» If both assertion and REASON are correct and REASONIS crect explanation for assertion If both assertion and reason are correct but reasonis not COTTECT explanation for assertion If reason is correct but assertion is incorrect If both assertion and reason are incorrect Answer :C

Discussion

45.	Assertion: Alkanes containing more than three carbon atoms exhibit chain isomerism. Reason: In an alkane, all carbon atoms are sp^(3) hybridised.
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. Answer :B

Discussion

46.	Assertion : Alkaline earth metals are harder than alkali metals Reason : Atomic radii Qf alkaline earth metals are smaller than corresponding alkali metals in the same periods of periodic table
Answer» both ASSERTION and reason are true and reason is the correct EXPLANATION of assertion both assertion and reason are true but reason is not the correct explanation of assertion assertion is true but reason is false both assertion and reason are false Answer :B

Discussion

47.	Assertion. Alkali metals impart colour to the flame . Reason. Their ionization energies are low .
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

48.	Assertion: Alkali metals are obtained by electrolysis of molten salt and not aqueous solution. Reason: The discharge potential of H^(+) ions is lower than alkali metals cation hence hydrogen is dicharged at cathode instead of metal.
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. Answer :A

Discussion

49.	Assertion : Alkali metals act asgood reducing agents Reason : Alkali metals have higher ionization energies.
Answer» ASSERTION is TRUE but Reason is FALSE Both Assertion and Reason are true Assertion is false but Reason is true BothAssertion and Reason are false Answer :A::B

Discussion

50.	Assertion : Alcohols and carbohydrates are soluble in water Reason : Water is non-polar solvent.
Answer» Both assertion and reason are TRUE and reason is the correct EXPLANATION of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is true but reason is false Both Assertion and reason are false Answer :B

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion. At same temperature, most probable speed of N_(2) is greater than that of Cl_(2). Reason. At the same temperature, fraction of N_(2) molecules possessing the most probable slope speed is greater than that of Cl_(2) molecules.

Assertion : At zero degree kelvin, the volume occupied by a gas is negligible. Reason : All molecular motion ceases at 0 K.

Assertion : At least one radioactive isotope of every element has been prepared in the laboratory. Reason : The bombardment of various atomic nuclei with common light weight projectile lead to artificial radioactivity.

Assertion. At high pressure, the compressibility factor Z is (1+(Pb)/(RT)). Reason. At high pressure, van der Waals equation is modified as P(V-b)=RT.

Assertion : At high altitudes , liquids boil at lower temperatures in comparison to that at sea level .Reason : At high altitudes , atmospheric pressure is low .

Assertion : At constant temperature, pV vs V plot for real gases is not a straight line. Reason : At high pressure all gases have Z gt 1 but at intermediate pressure most gases have Z lt 1.

Assertion : At constant temperature PV vs P plot for real gases is not a straight line .Reason : In the curves of dihydrogen and helium , as the pressure increases the value of PV also increases .

Assertion : At constant pressure, the volume of a given mass of a gas is inversely proportional to its absolute temperature. Reason : At absolute zero, the volume of a gas reduces to zero.

Assertion. Aqueous solution of ammonium carbonate is basic. Reason. Acidic or basic nature of a salt solution depends upon K_(a) and K_(b)value of acid and base forming the salt.

Assertion. Antiferromagnetic substances on heating to high temperature become paramagnetic . Reason. On heating, randomisation of spins occurs.

Assertion Antiferromagnetic substances can be made paramagnetic by heating. Reason(R)On heating some of theions changetheir direction of spin.

Assertion. Antiferromagnetic substance on heating temperature become paramagnetic. Raason. On heating, randomisation of spins occurs.

Assertion : An orbital cannot have more than two electrons, moreover, if an orbital has two electrons they must have opposite spins.Reason : No two electrons in an atom can have same set of all the four quantum numbers.

Assertion : An ideal solution obeys Raoults Law Reason: In an ideal solution , solvent-solvent as well assolute-solute interactins are similarto solute-solvent interactions.

Assertion : An element that has a fractional atomic mass. Reason : An element exist an isotope.

Assertion. An aqueous solution of ammonium acetate can act as buffer. Reason. An aqueous solution of any pure salt acts as a buffer.

Assertion Amorphous solids are isotropic. Reason(R)Amorphous solids do not possess rigidity.

Assertion . Among the alkali metals , lithium salts exhibit the least electrical conductance in aqueous solutions . Reason . Smaller the radius of the hydrated cation , lower is the electrical conductance in aqueous solutions .

Assertion :Among SiCl_4and C Cl_4 only SiCl_4 reacts with water. Reason : SiCl_4 is ionic and C Cl_4 is covalent .

Assertion : Among H_(2)^(-),He,He^(+), He^(2+), H_(2)^(-) has the largest their parent atoms.

Assertion : Ammonia reacts with water does not obey Henry's law. Reason : The gases reacting with the solvent does not obey Henry's law.

Assertion : Amides react with Br_(2) + KOH to give 1^(@) amine with one carbon less than parent atom Reason : The reaction occurs through a carbene intermediate

Assertion: Although the ionisation energy of iodine (1008 kJ mol) is much lower than that of hydrogen (1310 kJ mol^(-1)), yet, compounds of I^+ cation are very less. Reason: Iodine is electronegative element and hence cannot form compounds in positive oxidation states.

Assertion : Although aluminium is above hydrogen in electrochemical series, it is stable in air and water. Reason : The thin protective layer of oxide (AI_(2) O_(3)) on the surface protects the aluminium.

Assertion : alpha-particles are generally used as projectiles for transformation Reason : alpha-particles always experience repulsion from the positively charged nucleus.

Assertion : All the three isotope of hydrogen have almost the same chemical properties. Reason : Isotopes differ from one another in respect of the presence of neutrons.

Assertion : All the gases should be cooled below their critical temperature for liquification .Reason : Cooling slows down the movement of molecules therefore , intermolecular forces may hold the slowly moving molecules together and the gas liquifies .

Assertion : Allyl free radical is more stable than simple alkyl free radical. Reason : The allyl free radical is stabilized by resonance.

Assertion : All the carbon atoms of but-2-ene lie in one plane. Reason : All the carbon atoms in but-2-ene are sp^(2)-hybridized.

Assertion (A) : All the C atoms of but-2-ene lie in one plane Reason (R ): Double-bond C atoms are sp^(2)-hypbridised.

Assertion : All the carbon atoms of but-2-ene lie in one plane. Reason : All the carbon atoms in but-2-ene are sp^(2) hybridized.

Assertion. All isotopes of a given element show the same type of chemical behaviour Reason. The chemical properties of an atom are controlled by the number of electrons in an atom.

Assertion : All halogens undergo disproportionation reaction in alkaline medium. Reason : All halogens exhibit variable oxidation states.

Assertion. Alkynes are more reactive towards nucleophilic addition reaction as compared to alkenes Reason. Alkynes contain two pi bonds, while alkenes have only one pi bond

Assertion. Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene. Reason. Alkyl halides are less reactive than acyl halides.

Assertion: Alkyl iodide can be prepared by treating alkyl chloride/bromide with Nal in acetone. Reason : NaCl and NaBr are soluble in acetone but Nal is not.

Assertion : Alkyl carbanion like ammonia have pyramidal shape. Reason : The carbon atom carrying negative charge has an octet of electrons.

Assertion: Alkyl carbonaions like ammonia have pyramidal shape. Reason: The carbon carrying negative charge has an octet of electrons.

Assertion : Alkyl carbanions like ammonia have pyramidal shape. Reason : The carbon atom carrying negative charge has an octet of electrons.

Assertion: Alkenes are easily attacked by electrophilic reagents. Reason: Alkenes are unstable molecules in comparison to alkenes.

Assertion : Alkenes having more than three carbon atoms exhibit chain isomerism. Reason : All carbon atoms in alkanes are sp-hybridized.

Assertion :Alkanes having more than three carbon atoms exhibit chain isomerism. Reason : All carbon atoms in alkanes are sp-hybridized

Assertion: Alkanes containing more than three carbon atoms exhibit chain isomerism. Reason: In an alkane, all carbon atoms are sp^(3) hybridised.

Assertion : Alkaline earth metals are harder than alkali metals Reason : Atomic radii Qf alkaline earth metals are smaller than corresponding alkali metals in the same periods of periodic table

Assertion. Alkali metals impart colour to the flame . Reason. Their ionization energies are low .

Assertion: Alkali metals are obtained by electrolysis of molten salt and not aqueous solution. Reason: The discharge potential of H^(+) ions is lower than alkali metals cation hence hydrogen is dicharged at cathode instead of metal.

Assertion : Alkali metals act asgood reducing agents Reason : Alkali metals have higher ionization energies.

Assertion : Alcohols and carbohydrates are soluble in water Reason : Water is non-polar solvent.