52671 + Interview Questions in Chemistry in Class 11

1.	Passage Organic compounds mainly consist of covalent bonds. The electron pair in these covalent bonds may undergo displacement either of their own or under the influence of other species. The cleavage of covalent bond between two atoms takes place in homolytic or heterolytic fashion. The homolytic fission results into free radicals while heterolytic fission results into carbocations and carbanions. These are also called reaction intermediates and are attacked by electrophiles and nucleophiles. The electrophiles seek electron rich sites while nucleophiles seek electron deficient sites. Answer the followings Questions : Which of the following series contain only nucleophiles:
Answer» `AICI_3, BF_3, NH_3` `RCOO^(-), CH_(3)^(-), CN^(-)` `NH_(3), SO_(3), ROR` `NO_(2)^(+), BF_(3), CI^(+)` Answer :B

Discussion

2.	Justify the inclusion of alkali metals in the same group of the periodic table with reference to the following. (ii) Reducing nature.
Answer» Li Mg Ba K Answer :A

Discussion

3.	PASSAGE - IV : In periodic table metals show high reducing ability and non-metals show high oxidizing ability. The properties of metalloids in between metals and non-metals. In a group from top to bottom the reducing ability increases and in a period from left to right oxidizing ability increases. F_2 is strong oxidizing agen than Cl_2 due to
Answer» Bond energy of `F_2 LT Cl_2` Electroneativity of `CL GT F` I.P of `F gt Cl` Non-metallic nature of F is more Answer :A

Discussion

4.	PASSAGE - IV : In periodic table metals show high reducing ability and non-metals show high oxidizing ability. The properties of metalloids in between metals and non-metals. In a group from top to bottom the reducing ability increases and in a period from left to right oxidizing ability increases. In which of the following set both are metalloids
Answer» As,Se Si,P Mg,Al Sn,Pb Answer :A

Discussion

5.	AT673 K. in the formation of NH_(3) From N_(2) and H_(2) ,the partial pressures of N_(2) , H_(2) andand NH_(3)at equilibrium are 0.5 , 1 and 9 xx 10^(-3)atm respectively. (N_(2) + 3H_(2) hArr + Q) Report Delta K_(C) Value
Answer» <P>9.3 kcal 430 kcal 220 kcal 0.930 kcal Solution :`DELTA G^(@)= -2.303 RT log K_(P)` `=2.303 xx 2 xx 10^(-3) xx 673 log_(10)0.5` = 0.929 K.cal

Discussion

6.	AT673 K. in the formation of NH_(3) From N_(2) and H_(2) ,the partial pressures of N_(2) , H_(2) andand NH_(3)at equilibrium are 0.5 , 1 and 9 xx 10^(-3)atm respectively. (N_(2) + 3H_(2) hArr + Q) Report Delta G^(@) using K_(p) value
Answer» <P>22.66 kcal 11.33 kcal 61.33 kcal 30.2 kcal Solution :`Delta G^(@)= -2.303 RT log K_(P)` `=2.303 xx 2 xx 10^(-3) xx 673 log 2 xx 81 xx 10^(-6)` = 11.3 K.cal

Discussion

7.	AT673 K. in the formation of NH_(3) From N_(2) and H_(2) ,the partial pressures of N_(2) , H_(2) andand NH_(3)at equilibrium are 0.5 , 1 and 9 xx 10^(-3)atm respectively. (N_(2) + 3H_(2) hArr + Q) Calculate K_(c)for the reaction.
Answer» 0.1 0.2 0.4 0.5 Solution :`N_(2)+3H_(2) harr 2NH_(3)` `K_(P)=(PN^(2)H_(3))/(PN_(2).PH_(2)^(3))=((9 xx 10^(-3))^(2))/(0.5 xx 1)=2 xx 81 xx 10^(-6)` `K_(P)=K_(c)(RT)^(Delta n), K_(c)=(2 xx 81 xx 10^(-6))/((0.0821 xx 673)^(-2))=0.5`

Discussion

8.	As per Lechatlier's Principle any stress applied on the equilibrium state is minimised by shifting of equilibrium. PCl_(5) hArr PCl_(3) + Cl_(2) "," SO_(2) Cl_(2) hArr SO_(2) + Cl_(2) Both equilibria exist together in a flask. If some SO_(2) is introduced into the flask ______
Answer» `SO_2CI_2` concentration decreases degree of DISSOCIATION of `PCI_5` decreases degree of dissociation of `PCI_5`increases `PCI_3` concentration decreases Solution :If `SO_(2)` is ADDED, 2ND EQUATION shifts backward `Cl_(2)` decreases `:.` 1st equation shifts forward

Discussion

9.	As per Lechatlier's Principle any stress applied on the equilibrium state is minimised by shifting of equilibrium. Increase in volume of container shifts the equilibrium in forward direction in the case of ____
Answer» `N_(2(G))+3H_(2(g)) harr 2NH_(3(g))` `CaCO_(3(g)) harr CaO_((s)) + CO_(2(g))` `N_(2(g))+O_(2(g)) harr 2NO_((g))` `C_2H_5OH_((l))+CH_3COOH_((l)) harr CH_3COOC_2H_(5(l))+H_2O_((l))` Solution :Lechatelier.s principle

Discussion

10.	As per Lechatlier's Principle any stress applied on the equilibrium state is minimised by shifting of equilibrium. In which cases introduction of inert gas shifts the equilibrium in forward direction at constant pressure ?
Answer» `N_(2(G))+3H_(2(g)) harr 2NH_(3(g))` `N_2+3H_2 harr 2NH_3` `N_2O_4 harr 2NO_2` `S_8(R) harr S_8(M)` SOLUTION :Lechatelier.s principle

Discussion

11.	PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases. In the compunds KO_2,Cr_2,O_3,SO_2 and Cl_2O_3 Which element shows more valency with respect to oxygen
Answer» K Cr S Cl Answer :C

Discussion

12.	Passage 2 Antibiotics are the chemical substances which are produced by microorganisms like bacteria, fungi and moulds. Antibiotics can inhibit the growth or even destroy other microorganisms. Now-a-days, synthetic antibiotics are also available. The first successful antibiotic produced was penicillin. The antibiotics may be either bacteriocidal (kills the organism in the body) or bacteriostatic (inhibits the growth of organism). Ampicillin and amoxycillin are modified antibiotics. Broad spectrum antibiotics are effective against several types of harmful microorganisms. 5. Which of the following antibiotics is effective against tuberculosis ?
Answer» Chloromycetin Tetracycline Penicillin Streptomycin Answer :D

Discussion

13.	PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases. Whic pair of elements have positive electron affinity values
Answer» Be,Mg N,P Ca,Sr Ne,Ar Answer :A

Discussion

14.	PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases. The pair of elements with equal electro negativities
Answer» Na,K N,Cl O,S F,C Answer :B

Discussion

15.	PASSAGE - 2 : In periodic table there are nearly 110 elements are present majority of elements are present in solid state. There is no separate placement for isotopes of elements in periodic table. The atomic weight of an element is the average atomic weight of isotopes. Among IIA,HIA, VA,VIA, VIIA groups gaseous elements are present in
Answer» IA,IIA,VA only IIIA,VA,VIIA only VA,VIA,VIIA only IIIA,VA,VIA only Answer :C

Discussion

16.	PASSAGE - 2 : In periodic table there are nearly 110 elements are present majority of elements are present in solid state. There is no separate placement for isotopes of elements in periodic table. The atomic weight of an element is the average atomic weight of isotopes. The element which exhibits highest number of stable isotopes
Answer» Sn Pb Fe Pt Answer :A

Discussion

17.	PASSAGE - 2 : In periodic table there are nearly 110 elements are present majority of elements are present in solid state. There is no separate placement for isotopes of elements in periodic table. The atomic weight of an element is the average atomic weight of isotopes. In periodic table the liquid elements at room temperature are
Answer» CD,`Cl_2` `H_2O,HG` `Hg,Br_2` `O_2N_2` ANSWER :B

Discussion

18.	Passage 1 Synthetic detergents are cleansing agents which have all the propeties of soaps but they actually do no contain any soap. These can be used in both hard as well as soft water as they give foam even in hard water. All the detergents are not biodegadable and hence cause water pollution in rivers and other water ways. 5. Which of the following is an example of liquid dishwashing detergents ?
Answer» `CH_(3)-(CH_(2))_(10)-CH_(2)OSO_(3)^(-)Na^(+)` `[CH_(3)-(CH_(2))_(15)-underset(CH_(3))underset(\|" ")overset(CH_(3))overset(\|" ")(N-)CH_(3)]^(+)Br^(-)` Answer :B

Discussion

19.	Passage 1 Synthetic detergents are cleansing agents which have all the propeties of soaps but they actually do no contain any soap. These can be used in both hard as well as soft water as they give foam even in hard water. All the detergents are not biodegadable and hence cause water pollution in rivers and other water ways. Answer the following questions : 1. Which of the following are anionic detergents ?
Answer» Quarternary AMMONIUM salt of amine and acetate Sodium SALTS of sulphonated LONG chain hydrocarbons Lauryl alcohol ethoxylate Polythylene glycol stearate Answer :B

Discussion

20.	Passage 1 Synthetic detergents are cleansing agents which have all the propeties of soaps but they actually do no contain any soap. These can be used in both hard as well as soft water as they give foam even in hard water. All the detergents are not biodegadable and hence cause water pollution in rivers and other water ways. 4. Which of the following are not-ionic detergents ?
Answer» Lauryl ALCOHOL ethoxylate Polyethylene GLYCOL stearate Penta ERYTHRITOL MONO stearate Trimethyl steary AMMONIUM bromide Answer :D

Discussion

21.	Passage 1 Synthetic detergents are cleansing agents which have all the propeties of soaps but they actually do no contain any soap. These can be used in both hard as well as soft water as they give foam even in hard water. All the detergents are not biodegadable and hence cause water pollution in rivers and other water ways. 2. Which of the following are cationic detergents ?
Answer» SODIUM lauryl sulphate Pentaerythritol monosterate Cetyl TRIMETHYL AMMONIUM bromide Sodium tripolyhosphate Answer :C

Discussion

22.	PASSAGE - 1: In Mendeleeff's periodic table elements were classified on the basis of atomic weight & in modern periodic table on the atomic number. The lighter elements of 2 & 3 periods show similarities in their properties called diagonal relationship Due to digonal relation which pair are amphoteric in nature
Answer» `Li_2,O,MGO` `BEO,MgO` `B_2,O_3Al_2O_3` `BeO,Al_2O_3` ANSWER :D

Discussion

23.	PASSAGE - 1: In Mendeleeff's periodic table elements were classified on the basis of atomic weight & in modern periodic table on the atomic number. The lighter elements of 2 & 3 periods show similarities in their properties called diagonal relationship The atomic number of element separated from main body of periodic table is
Answer» 64 20 46 57 Answer :A

Discussion

24.	PASSAGE - 1: In Mendeleeff's periodic table elements were classified on the basis of atomic weight & in modern periodic table on the atomic number. The lighter elements of 2 & 3 periods show similarities in their properties called diagonal relationship 1. Which of the following element is not present in Mendeleeff's periodic table
Answer» CARBON CHLORINE Argon POTASSIUM ANSWER :C

Discussion

25.	Particulate pollutants will result in the health hazard named as ..........
Answer» SOLUTION :PNEUMOCONIOSIS

Discussion

26.	Particulates are added to the atmosphere by :
Answer» INDUSTRIAL processes COMBUSTION of fuels agriculture BURNING photosynthesis ANSWER :A::B::C

Discussion

27.	Particles with 5 micron size reaches to the longs directly .
Answer» Solution :False statement (PARTICLE with 1 micron SIZE reaches to the LONG DIRECTLY.)

Discussion

28.	Particles of soil at the bottom of a river remain separated, but they sick together when taken out. Name the property behind this.
Answer» SOLUTION :SURFACE TENSION

Discussion

29.	Particle nature of electron is proved by
Answer» Radioactivity CATHODE ray experiment Rutherford.s `ALPHA` -SCATTERING experiment Interference of ELECTRON beams Solution :Cathode rays are PARTICLES of electrons

Discussion

30.	Partial pressure of O_(2) in the reaction 1//2 P_(2) + 1//2 Q_(2) + 1//2 R_(2) hArr PQR,
Answer» `K_(p)` ` sqrt(K_(p))` `root(3)(K_(p))` ` 2 K_(p)` SOLUTION :For the given reaction`K_(p) =p_(O_(2))` `( :' [Ag (s)] =[Ag_(2)O (s) ] = 1 )`

Discussion

31.	Partial pressure of (p) is in proportional to the concentration (c) - explain.
Answer» Solution :For REACTIONS involving gases, however, it is usually more convenient to express the equilibrium CONSTANT in terms of partial PRESSURE. Equation of idea gas pV nRT ....(Eq.-i) `therefore p=(n/V)RT` …..(Eq. ii) If concentration =c mol `L^(-1)` OR mol/`dm^3` `therefore` p=cRT=[gas]RT ...(Eq. iii) where , R=0.0831 bar L `mol^(-1) K^(-1)` where, p = Pressure in pascal, n = Number of mol of the gas, V = Volume of gas `m^3` T = Temperature in Kelvin, `therefore n/V`= Concentration expressed in mol/`m^3` `therefore` At constant temperature, the p of the gas is proportional to its concentration p`prop`[gas], `1_"Pascal"=1 Nm^(-2)` and 1 bar = `10^5` Pa 1.013 bar =1 atm .

Discussion

32.	Partial pressure is given as __________
Answer» `("mole fraction")/("TOTAL pressure")` mole fraction `xx` total pressure `("mole fraction"xx"total pressure")/(2)` `(2XX"mole fraction")/("total pressure")` Answer :B

Discussion

33.	Paramagnetism isdue to the presence of _______ electrons .
Answer» PAIRED unpaired partially FILLED FULLY filled ANSWER :B

Discussion

34.	Paramagnetic species are-
Answer» `O_(2)^(+)` `O_(2)^(-)` `N_(2)^(+)` `N_(2)^(-)` ANSWER :A::B::C::D

Discussion

35.	Paramagnetic species are
Answer» `O_(2)^(+)` `O_(2)^(-)` `N_(2)^(+)` `N_(2)^(-)` ANSWER :A::B::C::D

Discussion

36.	Paragraph//Comprehension-2 Environment is defined as the sum total of physical and biological factors that directly influence the survival, growth ,development and reproduction of organisms.The additon of certain harmful wastes to air , water and soil by a natural source or due to certain human activitites to such a level of concentration which adversely effects the quality of environment is called environmental p[ollution and the undesirable material thus added to environment is called pollutant Photochemeical smog is the term used for the air [pollutants produced in the atmopsphere as a result of photochemical reactions .Classical smog or London smog is a combination of particulateed and gaseouir oxided of suphur present in the atomospher.CO_(2) is not considered as atmospheric polllutant but its increased concentrate leads to green house effect. Increased CO_(2) content in the atmosphee will lead to
Answer» INCREASE in EARTH's temperature increase in photo synthesis decreases in RATE of surface water evaporation increase in oxygen LEVEL of the atmosphere Answer :A

Discussion

37.	Paraffin means …………..
Answer» SOLUTION :Littleactivity

Discussion

38.	Paraffin dissolves in
Answer» DISTILLED water Methanol Benzene Salt water Answer :C

Discussion

39.	Para toluidine is treated with HNO_(2) at ice cold condtions and then boiled with water. The final product obtained is:
Answer» ANTHRANILIC acid p-cresol toluic acid phnol Solution :N//A

Discussion

40.	Para and ortho H_(2) differ in
Answer» ATOMIC number atomic mass spins of protons number of neutrons Answer :C

Discussion

41.	Para and ortho hydrogen differ in
Answer» ATOMIC NUMBER atomic mass spins of protons number of neutrons Answer :C

Discussion

42.	Paper chromatography is also called.............chromatography in which..............constitutes thestationary phase while a....................constitutes the mobile phase.
Answer» ANSWER :PARTITION or liquid/liquid, WATER CHEMICALLY bound to paper, mixture of SOLVENTS

Discussion

43.	Paper chromatography has following mobile and stationary phases respectively
Answer» liquid, solid solid, solid gas, liquid liquid, liquid Solution :The MOBILE phase in paper chromatography, of course,is a liquid while the stationary phase is also a liquid. It is the water which is adsorbed or chemically bound to the cellulose, i.e., paper. Thus, option (d) is correct.

Discussion

44.	PAN is one of the constituents of photochemical smog.(T/F)
Answer» ANSWER :T

Discussion

45.	PAN present in the photochemical smog stands for _____
Answer» ANSWER :peroxy ACYL NITRATES

Discussion

46.	Pair of ions with similar ionic radii
Answer» `LI^(+), MG^(2+)` `Li^(+), Na^(+)` `Mg^(2+), Ca^(2+)` `Mg^(2+), K^(+)` ANSWER :A

Discussion

47.	Pair of ions which are having same number of unpaired electrons
Answer» `Eu^(3+), Tb^(3+)` `Eu^(3+), CE^(3+)` `Eu^(3+), Sm^(3+)` `Eu^(3+), PR^(3+)` Answer :A

Discussion

48.	Pair of ions which are having only one unpair electron
Answer» `CE^(3+), Yb^(3+)` `EU^(3+), Tb^(3+)` `Pm^(3+), Sm^(3+)` `DY^(3+), Tb^(3+)` Answer :A

Discussion

49.	Pair of elements with equal values of electronegativiy
Answer» Be, Al Mg,Al Mg,Ca F,Ne Answer :A

Discussion

50.	Pair of elements having atomic numbers ......... possess same chemical properties.
Answer» 5, 18 10, 22 6, 20 3, 11 Solution :Elements having ATOMIC numbers 3 and 11 are Li and NA. The Li and Na are elements of same group `I^(ST)` .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Justify the inclusion of alkali metals in the same group of the periodic table with reference to the following. (ii) Reducing nature.

AT673 K. in the formation of NH_(3) From N_(2) and H_(2) ,the partial pressures of N_(2) , H_(2) andand NH_(3)at equilibrium are 0.5 , 1 and 9 xx 10^(-3)atm respectively. (N_(2) + 3H_(2) hArr + Q) Report Delta K_(C) Value

AT673 K. in the formation of NH_(3) From N_(2) and H_(2) ,the partial pressures of N_(2) , H_(2) andand NH_(3)at equilibrium are 0.5 , 1 and 9 xx 10^(-3)atm respectively. (N_(2) + 3H_(2) hArr + Q) Report Delta G^(@) using K_(p) value

AT673 K. in the formation of NH_(3) From N_(2) and H_(2) ,the partial pressures of N_(2) , H_(2) andand NH_(3)at equilibrium are 0.5 , 1 and 9 xx 10^(-3)atm respectively. (N_(2) + 3H_(2) hArr + Q) Calculate K_(c)for the reaction.

As per Lechatlier's Principle any stress applied on the equilibrium state is minimised by shifting of equilibrium. PCl_(5) hArr PCl_(3) + Cl_(2) "," SO_(2) Cl_(2) hArr SO_(2) + Cl_(2) Both equilibria exist together in a flask. If some SO_(2) is introduced into the flask ______

As per Lechatlier's Principle any stress applied on the equilibrium state is minimised by shifting of equilibrium. Increase in volume of container shifts the equilibrium in forward direction in the case of ____

As per Lechatlier's Principle any stress applied on the equilibrium state is minimised by shifting of equilibrium. In which cases introduction of inert gas shifts the equilibrium in forward direction at constant pressure ?

Particulate pollutants will result in the health hazard named as ..........

Particulates are added to the atmosphere by :

Particles with 5 micron size reaches to the longs directly .

Particles of soil at the bottom of a river remain separated, but they sick together when taken out. Name the property behind this.

Particle nature of electron is proved by

Partial pressure of O_(2) in the reaction 1//2 P_(2) + 1//2 Q_(2) + 1//2 R_(2) hArr PQR,

Partial pressure of (p) is in proportional to the concentration (c) - explain.

Partial pressure is given as __________

Paramagnetism isdue to the presence of _______ electrons .

Paramagnetic species are-

Paramagnetic species are

Paraffin means …………..

Paraffin dissolves in

Para toluidine is treated with HNO_(2) at ice cold condtions and then boiled with water. The final product obtained is:

Para and ortho H_(2) differ in

Para and ortho hydrogen differ in

Paper chromatography is also called.............chromatography in which..............constitutes thestationary phase while a....................constitutes the mobile phase.

Paper chromatography has following mobile and stationary phases respectively

PAN is one of the constituents of photochemical smog.(T/F)

PAN present in the photochemical smog stands for _____

Pair of ions with similar ionic radii

Pair of ions which are having same number of unpaired electrons

Pair of ions which are having only one unpair electron

Pair of elements with equal values of electronegativiy

Pair of elements having atomic numbers ......... possess same chemical properties.