94420 + Interview Questions in Chemistry in Class 12

1.	{:("Column "1,"Column "2),((A)"Soap in water",P. "Associated colloid"),((B)"Starch gelatin",Q. "Lyoptrilic colloid" ),((C) "Gold sol" ,R."Collodion"),((D)"Cellulose nitrate in alcohol",S. "Lyophobic colloid "):}
Answer» A-R, B-S, C-Q, D-P A-P, B-Q, C-S, D-R A-R, B-S, C-P, D-Q A-P, B-Q, C-R, D-S Answer :B

Discussion

2.	Colourless transition metal ion is:
Answer» `ZN^(2+)` `Cu^+` `Ti^(3+)` `All` ANSWER :D

Discussion

3.	Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn blue ?
Answer» `KNO_3` `AgNO_3` `ZN(NO_3)_2` `ZnSO_4` ANSWER :B

Discussion

4.	Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution turn blue.
Answer» `KNO_3` `AgNO_3` `ZN(NO_3)_3` `ZnSO_4` ANSWER :B

Discussion

5.	Colourless transition metal ion is
Answer» `ZN^(2+)` `TI^(3+)` `CR^(3+)` `V^(2+)` Answer :A

Discussion

6.	Colourless solution of (A) gives while ppt (B) with AgNO_(3)soluble in aqueous NH_(3) (a) also while given ppt (C ) with NaOH soluble is extrable in excess of it forming (D),(D) gives ppt .(E) with H_(2)S identify (A),(B),(C ),(D) and (E ).
Answer» SOLUTION :(A) `ZnCI_(2)` (B) `AgCI` (C ) `ZN(OH)_(2)` (D) `NaZnO_(2)` (E ) `ZNS`

Discussion

7.	Colourless salt (X) overset(Delta) to (Y) overset(Cu^(2+),Delta) to colouredhead (Z) ,(X) can be
Answer» BORAX Microcostric salt Copper sulphate None of these Answer :a,B

Discussion

8.	Colourless salt (X) overset(Delta) to (Y) overset(Cu^(2+),Delta) tocoloured head (Z) (X) can be
Answer» BORAX MICRO cosamic SALT both none Answer :C

Discussion

9.	Colourless salt (A) gives apple- green flame with cone. HCI (A) on reaction with dil H_(2)SO_(4) give light brown flame (D) turning KI -strach paper blue. (A) + CH_(3)COOH + K_(2)CrO_(4) rarr yellow ppt(B) (A) + H_(2)SO_(4) rarr (C ) ("white ppt") + (D) (D) + CH_(3)NH_(2) + CH_(3)OH + H_(2)O + gas (E ) (E ) + Mg overset(Delta)to (F) (F) + H_(2)O rarr NH_(3) Identify (A) to (F) and explain reaction.
Answer» Solution :(A) `BA(NO_(2))_(2)` (B) `BaCrO_(4)` (C ) `BaSO_(4)` (D) `HNO_(2)` (E ) `N_(2)` (F)`Mg_(2)N_(2)`

Discussion

10.	Colourless salt (A) overset(dil. HCI)rarr White ppt. (B) Iidentify (A),(B),(C ) and (D)
Answer» Solution :(A) `PB(NO_(3))_(2)` (B) `PbCI_(2)` (C ) `PbI_(2)`(D) `[FE(H_(2)O)_(3)NO]^(2+)`

Discussion

11.	Coloured salts are formed by
Answer» Alkali metals Lanthanides ACTINIDES TRANSITION metals Solution :Due to PRESENCE of vacant d-orbitals and they SHOW d-d transition.

Discussion

12.	Coloured ion among the following is
Answer» `Zn^(2+)` `Mn^(2+)` `CU^(1+)` `TI^(4+)` Solution :`Mn^(2+)`

Discussion

13.	Coloured complexes absorb radiation in the
Answer» VISIBLE REGION INFRARED region U.V. region far IR region Solution :visible region

Discussion

14.	Colour of transition metal complexes can be explained by:
Answer» COMPLETELY FILLED d-orbitals Vacant d-orbitals d-d transition None Answer :C

Discussion

15.	Colouration of Br_(2)//C Cl_(4) will be discharged by
Answer» Cinnamic acid<BR>Benzoic acid o-phthalic acid Acetophenone Solution :Cinnamic acid reacts with bromine in carbon tetrachloride to give dibromocinnamic acid. `C_(6)H_(5)CH=CHCOOH+Br_(2) overset(C Cl_(4))to UNDERSET("Dibromocinnamic acid")(C_(6)H_(5)-overset(Br)overset(\|)(CH)-overset(Br)overset(\|)(C)HCOOH)`

Discussion

16.	Colour of Ti^(4+) (3d^(0)) metal ion is
Answer» PURPLE. BLUE. green. colourless. ANSWER :D

Discussion

17.	Colour of the Cu_(2)O is due to
Answer» d-d TRANSITION p-p transition CHARGE TRANSFER f-f transition ANSWER :C

Discussion

18.	Colour of solid zinc is __________.
Answer» REDDISH brown green silvery white bluish white Answer :D

Discussion

19.	The colour of iodine solution is discharged by shaking it with aqueous solution of:
Answer» `H_2O_2` SODIUM sulphide Sodium thiosulphate Sodium sulphate Answer :C

Discussion

20.	Colour of osazone of glucose is :
Answer» Red Brown Yellow Orange Answer :C

Discussion

21.	Colour of iodine solution is disappeared by shaking it with aqueous solution of
Answer» `H_(2)SO_(4)` `Na_(2)S` `Na_(2)S_(2)O_(3)` `Na_(2)SO_(4)` SOLUTION :`2Na_(2)S_(2)O_(3) +I_(2) to 2NaI + Na_(2)S_(4) O_(6)`

Discussion

22.	Colour of Cu_(2)O is due to
Answer» d-d transition CHARGE transfer f-f transition geometry of `Cu_(2)O` ANSWER :B

Discussion

23.	Colour of compounds occurs due to phenomenon of polarisation, charge transfer, d-d transitionand H.O.M.O.L.U.M.O transition. Most of the transition metal transition metal complex compound are coloured either due to d-d electrons transition or charge transfer and ionic compounds are coloured due to polarisation of anion. Q. Which of the following is correct about KFE^(II)[underset(II)(Fe)(CN_(6))] and KFE^(III)[underset(III)(Fe)(CN_(6))] complex compounds?
Answer» Both are blue COLOURED compounds because colour arisesdue to d-d ELECTRONS transition in Fe cation present outside the complex ion. Both are blue coloured compounds because colour arisesdue to transfer of electron between `Fe^(II) and FE^(III)` cation Both are blue coloured compounds because in complexes `Fe^(II)` cation shows same d-d transition bond Complex (I) has blue colour becouse (II) has BROWN colour Answer :B

Discussion

24.	Colour of compounds occurs due to phenomenon of polarisation, charge transfer, d-d transitionand H.O.M.O.L.U.M.O transition. Most of the transition metal transition metal complex compound are coloured either due to d-d electrons transition or charge transfer and ionic compounds are coloured due to polarisation of anion. Q. Choose incorrect statement.
Answer» Halogens are coloured due to HOMO-LUMO TRANSITION During charge TRANSFER, OXIDATION state of ATOMS changes Higher the POLARISATION, more is colour intensity Comple compound having no unpaired electron can not undergo d-d transition and therefore it is colourless Answer :D

Discussion

25.	Colour of compounds occurs due to phenomenon of polarisation, charge transfer, d-d transitionand H.O.M.O.L.U.M.O transition. Most of the transition metal transition metal complex compound are coloured either due to d-d electrons transition or charge transfer and ionic compounds are coloured due to polarisation of anion. Q. If MCl_(4) salt is white, then comment on colour of its iodine salt.
Answer» Coloured White MAY be or coloured Black Answer :C

Discussion

26.	Colour of cobalt chloride solution is
Answer» PINK Black Colourless Green SOLUTION :`CoCl_(2)` solution is pink.

Discussion

27.	Colour of bromine in CS_2 is:
Answer» Green Orange Yellow Red Answer :A

Discussion

28.	Colour is imparted to glass by mixing:
Answer» SYNTHETIC dyes Metal oxides Oxides of non-metal Coloured salt Answer :B

Discussion

29.	Colour is imparted to glass by mixing
Answer» SYNTHETIC dyes Metaloxide Oxides of non-metal Coloured salt SOLUTION :Metal oxides or some salts are fused with GLASS to IMPARTED COLOUR of glass.

Discussion

30.	Colour in transition metal compounds is due to
Answer» small SIZED METAL ions absorption of light in UV REGION complete ns sub-shell d-d transition Answer :D

Discussion

31.	Colour imparted by Co(II) compounds to glass is…..
Answer» Green Brown Violet Blue Answer :D

Discussion

32.	Colour in transition metal compounds is attributed to :
Answer» Small SIZE metal IONS ABSORPTION of LIGHT in the UV region Complete ns-subshell d-d transition Answer :D

Discussion

33.	Colour display in green houses can be made with discharge tubes. The gas that is very frequently used for the display is
Answer» CHROMYL chloride Neon NITROUS OXIDE Kerypton ANSWER :B

Discussion

34.	{:("Coloumn-I",,"Column-II"),("(Aqueous solution in standard condition)",,"(Product of electrolysis using inert electrode)"),((A)"KCl",,(P)"Metal discharged at cathode"),((B)H_(2)SO_(4),,(Q)H_(2) "discharged"),((C)CuSO_(4),,(R )O_(2)"discharged" ),((D)NaNO_(3),,(S)"Non- metal discharged at both electrodes"),(,,(T)"Net cell reaction is" :2H_(2)OrarrO_(2)+2H_(2) ):}
Answer» ANSWER :(A)-(Q,S);(B)-(Q,R,S,T);(C )-(P,R);(D)-(Q,R,S,T)

Discussion

35.	Colloids have many characterstic properites. Among these Tyndall effect is an optical property and coagulation is the process of setting of colloidal particles.What is Tyndall effect?
Answer» ANSWER :The scattering of LIGHT by colloidal is known as TYNDALL effect.

Discussion

36.	Colloids exhibit certain special properties Name the property of colloid involed in the construction of ultramicroscope.
Answer» ANSWER :TYNDALL EFFECT

Discussion

37.	Colloids exhibit certain special properties. Explain the above property.
Answer» Answer :When a beam of light is PASSED through a colloidal solution, the path of the light beam becomes visible in the sol. This is DUE to scattering of light by COLLODIAL particles. This is CALLED Thndall EFFECT.

Discussion

38.	Colloids are widely used in industry and in daily life. Write any four applications of colloids.
Answer» ANSWER :REFER to SECTION 5.6

Discussion

39.	Colloids are widely used in industry and in daily life. What are colloids?
Answer» ANSWER :A colloid is a heterogeneous system in which the diameter of the PARTICLES of the disperse PHASE is between 1 and 1000 NM.

Discussion

40.	Colloidal systems are
Answer» Homogeneous Heterogeneous Suspensions Transparent Answer :B

Discussion

41.	Colloidal system is free from which of the following effect?
Answer» Effect of heat Effect of applied electric field Effect of ADDED electrolyte Effect of GRAVITATIONAL SOLUTION :Effect of gravitational

Discussion

42.	Colloidal sulphur is obtained when
Answer» sulphur is HEATED GRADUALLY to high temperature sulphur is heated with dilute sulphuric acid hydrogen sulphide is passed through an AQUEOUS solution of nitric acid sulphur is warned with carbon disulphide Answer :C

Discussion

43.	Colloidal sulphur is obtained by the action of HNO_3 on:
Answer» `H_2S` `HGS` `CAS` `CaS_2O_3` ANSWER :A

Discussion

44.	Colloidal sulphur is obtained by the action of HNO_(3) on _________.
Answer» `H_(2)S` `CaS_(2)` `Na_(2)S_(2)O_(3)` HgS Answer :A

Discussion

45.	Colloidal solutions of metals like gold can be prepared when their salt solutions react with certain substances like SnCl_(2) , formaldeyde, phenyl hydrazine , etc. 2AuCl_(3) + 3SnCl_(2) to 3SnCl_(4)+ underset("sol")(2Au)The above method is an example of
Answer» reduction method oxidation method hydrolysis method double decomposition method Solution :Salt solution of gold is being REDUCED to gold by using a reducing AGENT LIKE `SnCl_(2)`

Discussion

46.	Colloidal solutions of ink and graphite are prepared by ........... method.
Answer» SOLUTION :mechanicaldispersion

Discussion

47.	Colloidal solutions of metals like gold, silver and platinum are generally prepared by using:
Answer» peptization Bredig's are method Exchange of solvent Oxidation method Answer :B

Discussion

48.	Colloidal solution show Tyndall effect. Give two resasons.
Answer» Solution :(i) The diameter of the dispersed particles is not much smalleer as COMPARED to the wavelength of light USED. (ii0 There is a large DIFFERENCE in the REFRACTIVE indices of the dispersed phase and the dispersion medium.

Discussion

49.	Colloidal solution of silver is prepared by
Answer» BREDIG's are method Peptization Colloidal milk Double DECOMPOSITION method Answer :A

Discussion

50.	Colloidal solution of silver is prepared by :
Answer» COLLOIDAL milk Double decomposition method Bredig's method Peptization Solution :COLLIDAL sol of less REACTIVE mteal such as gold , silver platinum, copper, lead etc can be prepared by Bredig's method.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

{:("Column "1,"Column "2),((A)"Soap in water",P. "Associated colloid"),((B)"Starch gelatin",Q. "Lyoptrilic colloid" ),((C) "Gold sol" ,R."Collodion"),((D)"Cellulose nitrate in alcohol",S. "Lyophobic colloid "):}

Colourless transition metal ion is:

Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn blue ?

Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution turn blue.

Colourless transition metal ion is

Colourless solution of (A) gives while ppt (B) with AgNO_(3)soluble in aqueous NH_(3) (a) also while given ppt (C ) with NaOH soluble is extrable in excess of it forming (D),(D) gives ppt .(E) with H_(2)S identify (A),(B),(C ),(D) and (E ).

Colourless salt (X) overset(Delta) to (Y) overset(Cu^(2+),Delta) to colouredhead (Z) ,(X) can be

Colourless salt (X) overset(Delta) to (Y) overset(Cu^(2+),Delta) tocoloured head (Z) (X) can be

Colourless salt (A) overset(dil. HCI)rarr White ppt. (B) Iidentify (A),(B),(C ) and (D)

Coloured salts are formed by

Coloured ion among the following is

Coloured complexes absorb radiation in the

Colour of transition metal complexes can be explained by:

Colouration of Br_(2)//C Cl_(4) will be discharged by

Colour of Ti^(4+) (3d^(0)) metal ion is

Colour of the Cu_(2)O is due to

Colour of solid zinc is __________.

The colour of iodine solution is discharged by shaking it with aqueous solution of:

Colour of osazone of glucose is :

Colour of iodine solution is disappeared by shaking it with aqueous solution of

Colour of Cu_(2)O is due to

Colour of cobalt chloride solution is

Colour of bromine in CS_2 is:

Colour is imparted to glass by mixing:

Colour is imparted to glass by mixing

Colour in transition metal compounds is due to

Colour imparted by Co(II) compounds to glass is…..

Colour in transition metal compounds is attributed to :

Colour display in green houses can be made with discharge tubes. The gas that is very frequently used for the display is

Colloids have many characterstic properites. Among these Tyndall effect is an optical property and coagulation is the process of setting of colloidal particles.What is Tyndall effect?

Colloids exhibit certain special properties Name the property of colloid involed in the construction of ultramicroscope.

Colloids exhibit certain special properties. Explain the above property.

Colloids are widely used in industry and in daily life. Write any four applications of colloids.

Colloids are widely used in industry and in daily life. What are colloids?

Colloidal systems are

Colloidal system is free from which of the following effect?

Colloidal sulphur is obtained when

Colloidal sulphur is obtained by the action of HNO_3 on:

Colloidal sulphur is obtained by the action of HNO_(3) on _________.

Colloidal solutions of metals like gold can be prepared when their salt solutions react with certain substances like SnCl_(2) , formaldeyde, phenyl hydrazine , etc. 2AuCl_(3) + 3SnCl_(2) to 3SnCl_(4)+ underset("sol")(2Au)The above method is an example of

Colloidal solutions of ink and graphite are prepared by ........... method.

Colloidal solutions of metals like gold, silver and platinum are generally prepared by using:

Colloidal solution show Tyndall effect. Give two resasons.

Colloidal solution of silver is prepared by

Colloidal solution of silver is prepared by :