52671 + Interview Questions in Chemistry in Class 11

1.	{:("Column-I ","Column-II "),("A) Atm L mol"^(-1),"P)" a//Rb),("B) " sqrt((2RT)/(M)), "Q)" a//b),("C) Boyle temperature ","R)" V_m),("D) Volume of one mole","S) "u_(MP)):}
Answer» Solution :`T_b = a/(Rb) , V_m` = molar volume `U_(MP) = sqrt((2RT)/(M)) , a/b = ("atm - LIT"^2)/("mol"^2 XX ("lit")/("mol")) = ("atm - lit")/("mol")` .

Discussion

2.	Column IColumn II
Answer» SOLUTION : FOLLOW cannizaroreactionmechanism .

Discussion

3.	{:("List -I Salt","List -II Kg"),((A) AgCI,P.27S^(4)),((B)PbI_(2),Q.108(S)^(5)),((C )AS_(2)S_(3),R.4S^(3)),((D)Ag_(3)PO_(4),S.S^(2)):}
Answer» Solution :` AgCl hArr Ag^(+) +CL ,AgCl hArr UNDERSET(s) Ag^(+)+underset( S) Cl^(+) ` ` Ksp = S^(2) ` ` AgCl hArr Ag^(+) +Cl ,AgCl hArr underset(s) Ag^(+)+underset( S) Cl^(+) ` ` Ksp = S^(2) ` ` AS_2 S_3 hArr 2 underset(2S) AS^(+3)+underset( 3S) 3S^(-2) ` ` K_(sp)=[As^(+3) ] ^(2)[S^(-2) ]^(3)=(2S)^(2)(3s)^(3)=108 S^(5)` ` Ag_3 PO_4 hArr 3underset( 3s) Ag^(+)+underset(S) POunderset( 4) overset(-3) ` `K_(sp)=(3S)^(3)(S)=27 S^(4) `

Discussion

4.	Property to be determined Method used for determination{:("(P) Estimation of carbon and hydrogen in an organic compound","(i) Lassaigne's test"),("(Q) Estimation of nitrogen in aniline","(ii) Carius method"),("(R ) Estimation of chlorine in carbon tetrachloride","(iii) Liebig's method"),("(S) detection of nitrogen, sulphur and halogens","(iv) Kjeldahl's method"):}
Answer» SOLUTION :ESTIMATION of ORGANIC COMPOUNDS.

Discussion

5.	Column -I and Column -II contain four entries each. Entries of column-I are to be matched with some entries of column-II. One or more than one entries of column-I may have the matching with the same entries of column-II.
Answer» <P> Answer :A `RARR`P;B`to`Q,R;C`to`P;D`to`R, S

Discussion

6.	{:("Column-"," Column-II "),("A) Boyle's law ","P)" P_("obs") = P_("atm") +P_("water vapour")),("B) Avagadro's law ","Q)" V_1 = n_1 ((V_2)/(n_2))),("C) Charles' law ","R)" V_t = V_0 (1 + t/273)),("D) Dalton's law ","S)" V_1 = P_2((V_2)/(P_1))):}
Answer» SOLUTION :GAS LAWS.

Discussion

7.	Column-1 and column-II contains four entries each. Entries of column-I are to be matched with some entries of column-II .One or more than one entries of column-I may have the matching with the same entries of column-II
Answer» ANSWER :A::B::C::D

Discussion

8.	Colour of colloids depend on which of the following factors
Answer» Size Mass Charge Nature Solution :Colour of colloidal solution depends upon particle size. As the PARTICLES size increases, the colour of gold sol changes from red to blue and FINALLY to GOLDEN.

Discussion

9.	Coloumn I & Column II contain data on Schrondinger Wave-Mechanical model, where symbols have their usual meanings. Match the column :-
Answer» SOLUTION :s-orbital is SPHERICAL HENCE it is non-directional.

Discussion

10.	Colors of super oxides of alkali metals are ..... or ......
Answer» SOLUTION :YELLOW, ORANGE

Discussion

11.	Colloids and crystalloids differ w.r.t.
Answer» PHYSICAL STATE SIZE of the particle PROTECTIVE agent viscosity Solution :Size of the crystalloid particles in solution is less than colloidal particles.

Discussion

12.	Colloidion is a colloidal solution of
Answer» SOURCE in water cellulose in water cellulose NITRATE in water cellulose nitrate in ETHYL alcohol Answer :D

Discussion

13.	Colloidal sulphur is used as
Answer» a disinfectant a germ KILLER a TREATING EYE diseases a to raise vitality of human system Solution :Germ killer

Discussion

14.	Colloidal solutions of gold prepared by different methods are of different colours because of
Answer» variable valency of GOLD different CONCENTRATION of gold particles impurities produce by different methods different diameters of colloidal gold particles. Solution :Colour of a colloidal solutio, in general, depends UPON the size of the colloidal particles and POSITION of the viewer.

Discussion

15.	colloidal solutions of gold prepared by different methods are of different colours because of :
Answer» variable valenct of GOLD impurities produced by DIFFERENT methods different DIAMETERS of colloidal gold PARTICLES different concentration of gold particles ANSWER :C

Discussion

16.	Colloidal solution cannot be obtained from two such substances which are
Answer» INSOLUBLE in each other In same PHYSICAL state In DIFFERENT physical state None of these Answer :D

Discussion

17.	Colloidal solutioin of gold cannot be prepared by
Answer» BREDIG's are METHOD MECHANICAL dispersion Reduction of GOLD chloride Echange of solvents Answer :D

Discussion

18.	Colloidal sol found effectivein treating eye diseases is
Answer» COLLOIDAL sulphur colloidal antimony colloidal gold colloidal silver Answer :D

Discussion

19.	Colloidal particles of soap sol in water is
Answer» NEGATIVELY charged neutral Positively charged Unpredictable Answer :A

Discussion

20.	Colloidal gold is prepared by
Answer» MECHANICAL dispersion Peptisation BREDIG's ARC METHOD Hydrolysis Solution :By Bredig's arc method

Discussion

21.	Colloidal gold is given by injection
Answer» to act as a disinfectant to act as a GERM killer for treating EYE diseases to raise VITALITY of human system Solution :To raise vitality of human beings

Discussion

22.	Colloid of which one of the following can prepared by electrical dispersion method as well as reduction method ?
Answer» Sulphur Ferric hydroxide Arrhenius sulphide Gold Solution :Gold SOL by Bredig's METHOD .(Dispersion method) and by REDUCTION method `(AuCl_(3)+` Tannic ACID `to` Gold sol).

Discussion

23.	Colloid of which one of the following can be prepared by electrical dispersion as well as reduction method?
Answer» Sulphur Ferric hydroxide Arsenious sulphide Gold. Solution :Gold COLLOID can be prepared by BREDIG arc method as WELL as by reduction of `AuCl_(3)` with `SnCl_(2)`

Discussion

24.	Collodian is a 4% solution of which one of the following alcohol ether mixture
Answer» nitroglycerine cellulose acetate glycol dinitrite NITROCELLULOSE SOLUTION :Collodian is a solution of nitrocellulose in alcohol ETHER mixture.

Discussion

25.	Collision frequency (Z) of a gas at a particular pressure
Answer» decreases with the rise in temperature increases with the rise in temperature decreases initially and thereafter increases unpreductable Solution :Collision FREQUENCY = Collisions which all MOLECULES undergo in a unit volume per second `= (1)/(2)` collision no. `xx N//V` or `Z = (1)/(2) sqrt2 PI bar(v) sigma^(2) N//V xx N//V` `= (1)/(sqrt2) pi bar(v) sigma^(2) ((N^(2))/(V^(2)))` or `Z prop T` SINCE `bar(v) prop T`

Discussion

26.	Collision diameter is least in case of (1) H_2 , (2) He: (3) CO_2 : (4) N_2 Indicate with the number in brackets.
Answer» SOLUTION :He has LEAST `SIGMA.`

Discussion

27.	Collision cross-section is an area of an imaginary sphere of radius sigma around the molecule within which the centre of another molecule cannot penetrate. The volume swept by a single molecule in unit time is V=(pisigma^(2))overline(u)where overline(u) is the average speed If N^() is the number of molecules per unit volume, then the number of molecules within the volume V is N=VN^()=(pisigma^(2)overline(u))N^() Hence, the number of collision made by a single molecule in unit time will be Z=N=(pi sigma^(2)overline(u))N^() In order to account for the movements of all molecules, we must consider the average velocity along the line of centres of two coliding molecules instead of the average velocity of a single molecule . If it is assumed that, on an average, molecules collide while approaching each other perpendicularly, then the average velocity along their centres is sqrt(2)overline(u) as shown below. Number of collision made by a single molecule with other molecule per unit time is given by Z_(1)=pisigma^(2)(overline(u)_("rel"))N^()=sqrt(2) pisigma^(2)overline(u)N^() The total number of bimolecular collisions Z_(11) per unit volume per unit time is given by Z_(11)=(1)/(2)(Z_(1)N^())"or" Z_(11)=(1)/(2)(sqrt(2)pisigma^(2)overline(u)N^())N^()=(1)/(sqrt(2))pisigma^(2)overline(u)N^(2) If the collsion involve two unlike molecules then the numberof collisions Z_(12) per unit volume per unit time is given as Z_(12)= pisigma _(12)^(2)(sqrt((8kT)/(pimu)))N_(1)N_(2) where N_(1) and N_(2) are the number of molecules per unit volume of the two types of molecules, sigma_(12) is the average diameter of the two molecules and mu is the reduced mass. The mean free path is the average distance travelled by a molecule between two successivecollisions. We can express it as follows : lambda=("Average distance travelled per unit time")/("NO. of collisions made by a single molecule per unit time")=(overline(u))/(Z_(1)) "or"lambda=(overline(u))/(sqrt(2)pisigma^(2)overline(u)N^())implies(1)/(sqrt(2)pisigma^(2)overline(u)N^()) For a given gas the mean free path at a particular pressure is :
Answer» independent to TEMPERATURE DECREASES with rise in temperature increases with rise in temperature directly proportional to `T^(2)` Answer :C

Discussion

28.	Colligative properties of a solution depend in ………………..present in it.
Answer» SOLUTION :NUMBER of SOLUTE PARTICLES

Discussion

29.	Colemanite + Na_(2)CO_(3)overset(" Fused")rarr (A)+(B)+CO_(2)underset("solution)((A))+CO_(2)rarr (B)+Na_(2)CO_(3)(B)+conc.HCl rarr NaCl+underset("Acid")((C )) underset("Acid")((C ))+H_(2)O rarr underset("Acid")((D))(D)overset("strong heating")rarr (E )(E )+CuSO_(4)overset("Heated")underset("in flame")rarr underset("Blue coloured compound")((F))Compound (D) is
Answer» `H_(2)B_(4)O_(7)` `HBO_(2)` `H_(3)BO_(3)` `H_(2)O` Solution :`D-H_(3)BO_(3), E-B_(2)O_(3) , F-Cu(BO_(2))_(2)`

Discussion

30.	Colemanite + Na_(2)CO_(3)overset(" Fused")rarr (A)+(B)+CO_(2)underset("solution)((A))+CO_(2)rarr (B)+Na_(2)CO_(3)(B)+conc.HCl rarr NaCl+underset("Acid")((C )) underset("Acid")((C ))+H_(2)O rarr underset("Acid")((D))(D)overset("strong heating")rarr (E )(E )+CuSO_(4)overset("Heated")underset("in flame")rarr underset("Blue coloured compound")((F))Compound (B) is
Answer» `Na_(2)B_(4)O_(7)` `NaBO_(2)` `Na_(3)BO_(3)` NaOH Solution :`B-Na_(2)B_(4)O_(7), C-H_(2)B_(4)O_(7)`

Discussion

31.	Colemanite + Na_(2)CO_(3)overset(" Fused")rarr (A)+(B)+CO_(2)underset("solution)((A))+CO_(2)rarr (B)+Na_(2)CO_(3)(B)+conc.HCl rarr NaCl+underset("Acid")((C )) underset("Acid")((C ))+H_(2)O rarr underset("Acid")((D))(D)overset("strong heating")rarr (E )(E )+CuSO_(4)overset("Heated")underset("in flame")rarr underset("Blue coloured compound")((F))Colemanite is
Answer» `Ca_(2)B_(2)O_(11)` `Ca_(2)B_(6)O_(11)` `Ca_(4)B_(4)O_(11)` `Ca_(6)B_(6)O_(11)` SOLUTION :COLEMANITE `- Ca_(2)B_(6)O_(11) , A - NaBO_(2)`

Discussion

32.	[Co(H_2O)_6]_((aq))^(3+) + 4Cl_((aq))^(-) hArr [CoCl_4]_((aq))^(2-) + 6H_2O this reaction is endothermic and if blue colour is due to CoCl_(4(aq))^(2-). If this mixture kept in ice than what happen ?
Answer» Solution :This reaction is endothermic. If placed in ICE so temperature DECREASES than heat release and reaction proceed in REVERSE direction and blue colour of `CoCl_4^(2-)` decreases and PINK colour of `[Co(H_2O)_6]^(3+)`increases.

Discussion

33.	[Co(H_2O)_6]_((aq))^(3+) + 4Cl_((aq))^(-) hArr [CoCl_4]_((aq))^(2-) + 6H_2O this reaction is endothermic and if blue colour is due to CoCl_(4(aq))^(2-). If this mixture kept in ice than What happened when reaction vessel ofis kept in 80^@C containing water ?
Answer» Solution :Thus, temperature increase i.e., ENDOTHERMIC reaction So, reaction will be forward. The CONCENTRATION of BLUE colour product `[CoCl_4]^(2+)`is increases and blue colour BECOME dark.

Discussion

34.	[Co(H_(2)O)_(6)]^(2+)(aq)("pink")+4Cl^(-)(aq)hArr[CoCl_(4)]^(2+)(aq)("blue")+6H_(2)O(l) In the above reaction at equilibrium, the reaction mixture is blue in colour at room temperature. On cooling this mixture, it becomes pink in colour On the basis of this information, which one the following is true ?
Answer» `DeltaHgt0` for the FORWARD REACTION `DeltaH=0` for the REVERSE reaction `DELTAHLT0` for the forward reaction SIGN of the `DeltaH` cannot be predicted bassed on this information. Answer :A

Discussion

35.	[Co(H_2O)_6]^(2+) (aq) " (pink) " + 4Cl^(-) (aq) hArr [COCl_4]^(2-) (aq) "(blue)"+6H_2O (l) In the above reaction at equilibrium,the reaction mixture is blue in colour at room temperature. On cooling this mixture,it becomes pink in colour. On the basis of this information, which one of the following is true ?
Answer» `Delta gt 0` for the forward reaction `Delta H = 0` for the reverse reaction `Delta lt 0 ` for the forward reaction Sign of the `Delta H` cannot be PREDICTED based on this information. Solution :On COOLING, reverse reaction predominates and the solution is pink in colour. `:.` Decrease in temperature, favours the reverse reaction i.e., reverse reaction is exothermic `(DELTAH LTO)` and for the forward reaction is endothermic `(DeltaH gt 0)`.

Discussion

36.	CO_((g)) + 2H_(2(g)) hArr CH_3OH_((g)) for this reaction is K_c is 0.5. If the concentration of CO and H_2 at equilibrium 0.18M and 0.22 M respectively what is the concentration of CH_3OH ?
Answer» SOLUTION :`4.56xx10^(-3)` M

Discussion

37.	Coefficients of MnO_(4)^(-), C_(2)O_(4)^(2-) and H^(+) in the balanced reaction, MnO_(4)^(-)+C_(2)O_(4)^(2-)+H^(+) to Mn^(2+)+CO_(2)+H_(2)O
Answer» 2,3 and 8 2,5 and 8 2,3 and 16 2,5 and 16 Answer :D

Discussion

38.	COD of a water sample is 8ppm the weight of acidified K_(2)Cr_(2) O_(7) required to oxidise the organie matter present in one litre of water sample is
Answer» 98 MG 49 mg 196 mg 98 g Answer :B

Discussion

39.	Cod Liver oil is
Answer» FAT DISPERSED in water Water dispersed in fat Water dispersed in oil Fat dispersed in fat. Answer :C

Discussion

40.	COD is a measure of
Answer» ORGANIC substances in water Oxides of S, P and N in air Inorganic pollutants in water SALINITY of water Answer :A

Discussion

41.	Coconut oil on alkaline hydrolysis gives
Answer» Glycol Alcohol GLYCEROL Glucose Solution :Glycerol (by SAPONIFICATION)

Discussion

42.	Coal tar is the main source of
Answer» AROMATIC compounds alicyclic compounds aliphatic compounds nitro compounds. Answer :A

Discussion

43.	Coal miners may suffer from …………. .
Answer» TUBERCULOSIS BLACK LUNG DISEASE White lung disease Malaria Solution :Black lung disease

Discussion

44.	Coal miners may suffer from...........
Answer» SOLUTION :BLACK LUNG DISEASE

Discussion

45.	Coal gas
Answer» BURNS with a smoky flame burns with non-smoky flame is a GOOD fuel is not USED for lighting purpose Solution :Coal gas is a good fuel and burns with non-smoky flame

Discussion

46.	CO_(3)O_(4) is an oxide of Ca (III) and Cu (II) .If its formula is CO_(x)(II)CO_(y)(II)O_(4) , then what is the value of x and y ?
Answer» SOLUTION :The SUM of oxidaiton number of the elements in a compound is equal to ZERO `CO_(x)(II)CO_(y)(II)O_(4)`,2x+3y -4xx2=0 or, 2x+3y=9 The only solution for this EQUATION is x=1 and y=2.

Discussion

47.	CO_(2)andC_(2)H_(2) (acetylene) are non-polar.
Answer» SOLUTION :Because both have LINEAR STRUCTURE.

Discussion

48.	CO_2 is used for extinguishing fire because
Answer» It has RELATIVELY high CRITICAL temperature In SOLID state, it is called dry ICE It is neither combustible nor a supporter of combustion It is colourless GAS Answer :C

Discussion

49.	CO_(2) is not a poisnous gas but there is increase in concentration of CO_(2) in the atmosphere due to during of fossil fuels and decomposition of limestone. The increase in concentration of CO_(2) may lead to
Answer» increase in photosynthesis in plants higher concentration of `CO_(2)` in water increase in greenhouse effect, thus raising the temperature increase in FORMATION of metal carbonates Solution :Increase in concentration of `CO_(2)` will RESULT in increase in greenjhouse effect thus raising the temperature which MIGHT have serious CONSEQUENCES.

Discussion

50.	CO_(2) is linear whereas SO_(2) is bend-shaped. Give reason? Why does H_(2)O have bent structure?
Answer» Solution :`CO_(2)` does not have LONE PAIRS. `SO_(2)` has two lone pairs

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

{:("Column-I ","Column-II "),("A) Atm L mol"^(-1),"P)" a//Rb),("B) " sqrt((2RT)/(M)), "Q)" a//b),("C) Boyle temperature ","R)" V_m),("D) Volume of one mole","S) "u_(MP)):}

Column IColumn II

{:("List -I Salt","List -II Kg"),((A) AgCI,P.27S^(4)),((B)PbI_(2),Q.108(S)^(5)),((C )AS_(2)S_(3),R.4S^(3)),((D)Ag_(3)PO_(4),S.S^(2)):}

Column -I and Column -II contain four entries each. Entries of column-I are to be matched with some entries of column-II. One or more than one entries of column-I may have the matching with the same entries of column-II.

{:("Column-"," Column-II "),("A) Boyle's law ","P)" P_("obs") = P_("atm") +P_("water vapour")),("B) Avagadro's law ","Q)" V_1 = n_1 ((V_2)/(n_2))),("C) Charles' law ","R)" V_t = V_0 (1 + t/273)),("D) Dalton's law ","S)" V_1 = P_2((V_2)/(P_1))):}

Column-1 and column-II contains four entries each. Entries of column-I are to be matched with some entries of column-II .One or more than one entries of column-I may have the matching with the same entries of column-II

Colour of colloids depend on which of the following factors

Coloumn I & Column II contain data on Schrondinger Wave-Mechanical model, where symbols have their usual meanings. Match the column :-

Colors of super oxides of alkali metals are ..... or ......

Colloids and crystalloids differ w.r.t.

Colloidion is a colloidal solution of

Colloidal sulphur is used as

Colloidal solutions of gold prepared by different methods are of different colours because of

colloidal solutions of gold prepared by different methods are of different colours because of :

Colloidal solution cannot be obtained from two such substances which are

Colloidal solutioin of gold cannot be prepared by

Colloidal sol found effectivein treating eye diseases is

Colloidal particles of soap sol in water is

Colloidal gold is prepared by

Colloidal gold is given by injection

Colloid of which one of the following can prepared by electrical dispersion method as well as reduction method ?

Colloid of which one of the following can be prepared by electrical dispersion as well as reduction method?

Collodian is a 4% solution of which one of the following alcohol ether mixture

Collision frequency (Z) of a gas at a particular pressure

Collision diameter is least in case of (1) H_2 , (2) He: (3) CO_2 : (4) N_2 Indicate with the number in brackets.

Colligative properties of a solution depend in ………………..present in it.

[Co(H_2O)_6]_((aq))^(3+) + 4Cl_((aq))^(-) hArr [CoCl_4]_((aq))^(2-) + 6H_2O this reaction is endothermic and if blue colour is due to CoCl_(4(aq))^(2-). If this mixture kept in ice than what happen ?

[Co(H_2O)_6]_((aq))^(3+) + 4Cl_((aq))^(-) hArr [CoCl_4]_((aq))^(2-) + 6H_2O this reaction is endothermic and if blue colour is due to CoCl_(4(aq))^(2-). If this mixture kept in ice than What happened when reaction vessel ofis kept in 80^@C containing water ?

CO_((g)) + 2H_(2(g)) hArr CH_3OH_((g)) for this reaction is K_c is 0.5. If the concentration of CO and H_2 at equilibrium 0.18M and 0.22 M respectively what is the concentration of CH_3OH ?

Coefficients of MnO_(4)^(-), C_(2)O_(4)^(2-) and H^(+) in the balanced reaction, MnO_(4)^(-)+C_(2)O_(4)^(2-)+H^(+) to Mn^(2+)+CO_(2)+H_(2)O

COD of a water sample is 8ppm the weight of acidified K_(2)Cr_(2) O_(7) required to oxidise the organie matter present in one litre of water sample is

Cod Liver oil is

COD is a measure of

Coconut oil on alkaline hydrolysis gives

Coal tar is the main source of

Coal miners may suffer from …………. .

Coal miners may suffer from...........

Coal gas

CO_(3)O_(4) is an oxide of Ca (III) and Cu (II) .If its formula is CO_(x)(II)CO_(y)(II)O_(4) , then what is the value of x and y ?

CO_(2)andC_(2)H_(2) (acetylene) are non-polar.

CO_2 is used for extinguishing fire because

CO_(2) is not a poisnous gas but there is increase in concentration of CO_(2) in the atmosphere due to during of fossil fuels and decomposition of limestone. The increase in concentration of CO_(2) may lead to

CO_(2) is linear whereas SO_(2) is bend-shaped. Give reason? Why does H_(2)O have bent structure?