94420 + Interview Questions in Chemistry in Class 12

1.	Colloidal solution of gold prepared by different methods of different colours because of :
Answer» DIFFERENT diameters of colloidal gold particles variable VALENCY of gold different CONCENTRATION of gold particles impurities PRODUCED by different methods Answer :A

Discussion

2.	Colloidal solution of ink is prepared by
Answer» MECHANICAL dispersion electro dispersion ultrasonic dispersion peptisation Answer :A

Discussion

3.	Colloidal solution of gold prepared by different methods have different colours, because
Answer» VARIABLE VALENCY of GOLD Different concentrations of gold particles Impurities produced by different mentods Different DIAMETERS of COLLOIDAL gold particle Answer :D

Discussion

4.	Colloidal solution is
Answer» True SOLUTION SUSPENSION HETEROGENOUS solution HOMOGENEOUS solution ANSWER :C

Discussion

5.	Colloidal solution commonly used in the treatment of eye disease is
Answer» COLLOIDAL SILVER Clloidal gold Colloidal ANTIMONY colloidal SULPHUR ANSWER :A

Discussion

6.	Colloidal solution can be made in water and in air as media. What distinctive names are given to these two types of sols ?
Answer» SOLUTION :HYDROSOL and AEROSOL

Discussion

7.	Colloidal sols which can be prepared ddirectly by micing a substance with the dispersiion medium are called………..
Answer» SOLUTION :LYOPHILIC

Discussion

8.	Colloidal sols are not purified by
Answer» DIALYSIS ELECTRO dialysis Electrophoresis ULTRA filtration Answer :C

Discussion

9.	Colloidal sol is :
Answer» TRUE SOLUTION Suspension solution Heterogeneous solution HOMOGENEOUS solution. Answer :C

Discussion

10.	Colloidal sol found effective in treating eye disease is
Answer» COLLOIDAL sulphur colloidal antimony colloidal gold colloidal silver. Solution :Colloidal silver i.e. argyrol is USED in TREATING EYE DISEASE.

Discussion

11.	Colloidal particles always carry an electric charge which of the following statements is true ?
Answer» All the colloidal PARTICLES carry the same charge. The charge CHANGES with the CHANGE of temperature. Half the colloidal particles carry positive charge and the other half carry negative charge. None of these Solution :All the colloidal particles carry the same charge.

Discussion

12.	Colloidal particle present in colloidal solution are good adsorber. Why ?
Answer» SOLUTION :Colloidal particles have large SURFACE AREA and hence are good adsorbents.

Discussion

13.	Colloidal ink and graphite are prepared by ......
Answer» COLLOID MILL BREDIG's arc ultrasonic homogenizer peptisation SOLUTION :colloid mill

Discussion

14.	Colloidal milk of magnesia is used
Answer» as GERM killer as FERTILIZER for STOMACH disorders as tonic Answer :C

Discussion

15.	Colloidal graphite is prepared by____ method.
Answer» eletrodispersion MECHANICAL DISPERSION ultrasonic dispersion peptisation Answer :B

Discussion

16.	Colloidal gold sol can be preared by the reduction of soluble salt solution such as AuCl_3 with
Answer» `SnCl_2` hydrazine formaldehyde with any ONE of the above Answer :D

Discussion

17.	Colloidal gold is given by injection to act as:
Answer» Disinfectant Anticancer agent Germ killer Tonic to RAISE VITALITY of HUMAN system Answer :C

Discussion

18.	Colloidal dispersion of a liquid in a gas is called……….
Answer» SOLUTION :AEROSOL

Discussion

19.	Colloid of which one of the following can be prepared by electrical dispersion method as well as reduction method?
Answer» Sulphur Ferric hydroxide Aresenious sulphide Gold Solution :REFER PREPARATION of LYOPHOBIC SOLS

Discussion

20.	Colloid is which type of system?
Answer» Only HETEROGENEOUS Homogeneous and heterogeneous Only homogeneous None of the above SOLUTION :Only heterogeneous

Discussion

21.	Collodion is a 4% solution of which one of the following compounds in alcohol - ether mixture?
Answer» Nitroglycerine CELLULOSE ACETATE Glycoldinitrate NITROCELLULOSE Solution :Nitrocellulose PYROXYLIN ( NITRO cellulose )

Discussion

22.	Colloid form by addition of excess amount of KI in AgNO_(3) solution is of ......... type.
Answer» POSITIVE CHARGED NEGATIVE charged Neutral Can't SAY SOLUTION :Negative charged

Discussion

23.	Co^(2+)(aq.)+SCN^(-) (aq.) to "Complex"(X) Ni^(2+)(aq.) +"Dimethylglyoxime" overset(NH_(4)OH) to "Complex"(Y) The coordination number of cobalt and nickel in complexes X and Y are four. The IUPAC name of the complexes (X) and (Y) are respectively :
Answer» tetrathiocyanoato-S-cobalt(II) and BIS(dimethylglyoximate) nickel (II). tetrathiocyanoato-S-cobaltate(II) and bis(DIMETHYLGLYOXIMATO) nickel (II). tetrathiocyanoato-S-cobaltate(II) and bis(dimethylglyoximato) nickelate (II). tetrathiocyanoato-S-cobaltate(III) and bis(dimethylglyoximato) nickel (II). Answer :B

Discussion

24.	Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?
Answer» Nitroglycerine CELLULOSE ACETATE Glycoldinitrate Nitrocellulose Solution :HINT : PYROXYLIN (NITRO cellulose)

Discussion

25.	Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X). Ni^(2+)(aq)+"Dimethylglyoxime" overset(NH_(4)OH) to "Complex" (Y). The coordination number of cobalt and nickel in complexes X and Y are four. Select the correct statement for the complexes (X) and (Y).
Answer» (X) is paramagnetic with two unpaired electrons. (Y) is diamagneitc and shows intermolecular H-bonding (X) is paramagnetic with three unpaired electrons and (Y) is diamagnetic. (X) and (Y) both are diamagnetic Solution :`{:([X] to K_(2)[Ni(CN)_(4)],, B to K_(2)[overset(+2)(Ni)(DMG)_(2)]) , ("(Tetrahedral)" , "(Square planar)"), ("(spin free)" , "(spin paired)"), (d^(7) "," SP^(3), d^(8) "," dsp^(2)), (3u.p . E^(-)"(Paramag.)" , "(DIMAG.)"):}`

Discussion

26.	Collodion is a 4% solituon of which one of the following in alcohol-enter mixture ?
Answer» ANSWER :CELLULOSE NITRATE

Discussion

27.	Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X). Ni^(2+)(aq)+"Dimethylglyoxime" overset(NH_(4)OH) to "Complex" (Y). The coordination number of cobalt and nickel in complexes X and Y are four. The geometry of complexes (X) and (Y) are respectively :
Answer» TETRAHEDRAL and square planar both tetrahedral square planar and tetrahedral both square planar Solution :`{:([X] to K_(2)[Ni(CN)_(4)],, B to K_(2)[overset(+2)(Ni)(DMG)_(2)]) , ("(Tetrahedral)" , "(Square planar)"), ("(SPIN free)" , "(spin paired)"), (d^(7) "," sp^(3), d^(8) "," dsp^(2)), (3u.p . e^(-)"(Paramag.)" , "(Dimag.)"):}`

Discussion

28.	Collodion is 4% solution of ........... in a mixture of ........
Answer» SOLUTION :NITRO CELLULOSE , ALCOHOL and WATER

Discussion

29.	Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X). Ni^(2+)(aq)+"Dimethylglyoxime" overset(NH_(4)OH) to "Complex" (Y). The coordination number of cobalt and nickel in complexes X and Y are four. The IUPAC names of the complexes (X) and (Y) are respectively.
Answer» tetrahiocyanato-S-cobalt (II) and bis(dimethylglyoximate) nickel(II). tetrathiocyanato-S-cobaltate (II) and bis(dimethylglyoximato) nickel (II). tetrathiocyanato-S-cobaltate (II) and bis(dimethylglyoximato) nickelate(II). tetrathiocyanato-S-cobaltate (II) and bis(dimethylglyoximato) nickel(II). SOLUTION :`{:([X] to K_(2)[Ni(CN)_(4)],, B to K_(2)[OVERSET(+2)(Ni)(DMG)_(2)]) , ("(Tetrahedral)" , "(Square planar)"), ("(spin FREE)" , "(spin paired)"), (d^(7) "," sp^(3), d^(8) "," dsp^(2)), (3u.p . e^(-)"(Paramag.)" , "(Dimag.)"):}`

Discussion

30.	Colloddal particles exhibit Tyndall ellect due to:
Answer» POLARISATION of LIGHT scattering of light reflection of light refraction of light, ANSWER :B

Discussion

31.	CO_2 and N_2 are non-supporters of combustion . However, for putting out fires CO_2 is preferred over N_2 because CO_2:
Answer» Does not burn Forms non-combustible PRODUCTS with burning substances Is DENSER than nitrogen Is a more reactive gas Answer :C

Discussion

32.	Collision theory was proposed by.........in 1916 and .......in 1918.
Answer» SOLUTION :MaxTrautz, WILLIAM LEWIS

Discussion

33.	CO_(2) and N_(2) are non-supporters of combustion. However for putting our fires CO_(2) is preferred over N_(2) because CO_(2)
Answer» does not durn forms non-combustible PRODUCTS with burning substance is denser than nitrogen is a more REACTIVE gas Solution :`CO_(2)` being more dense covers the igniting material more effectively than ` N_(2)`

Discussion

34.	Co-polymer is:
Answer» Nylon-6 Nylon-6,6 Bakelite Polyethene Answer :B

Discussion

35.	CO reacts with chlorine in presence of sunlight to give :
Answer» `COCl_2` `CO_2` `CCl_4` `CHCl_3` ANSWER :A

Discussion

36.	Co-polymer is not:
Answer» Nylon-6 Nylon-6,6 Bakelite Polyethene Answer :B

Discussion

37.	Collision theory satisfactorily explains
Answer» FIRST ORDER REACTIONS unimolecular reactions BIMOLECULAR reactions any order reactions. Solution :bimolecular reactions

Discussion

38.	Co-polymer is
Answer» nylon-6 nylon-6,6 PMMA polyethylene. Solution : Nylon-6,6 is a co-polymer of ADIPIC ACID and HEXAMETHYLENEDIAMINE.

Discussion

39.	Co-ordination number of platinum [Pt(NH_(3))_(4)Cl_(2)]^(2+)
Answer» 4 2 8 6 Answer :D

Discussion

40.	Coordination number of Cr is 6. A complete entity with C_(2)O_(4)^(-2), en superoxide as ligands is [Cr(C_(2)O_(4))_(x)(en)_(y)(O_(2))_(z)]^(+). The ratio of x: y : z is
Answer» `1 : 1 : 2` `1 : 1 : 1` `1 : 2 :2 ` `2 : 1: 1 ` ANSWER :A

Discussion

41.	Co-ordination number of Cr in CrCl_(3).5H_(2)O is six. The maximum volume of 0.1 N AgNO_(3) needed to precipitate the chlorinein outer sphere in 200ml of 0.01M solution of the complex is/are :
Answer» 140 ml 40 ml 80ml 20ml Solution :`[CR(H_(2)O)_(5)Cl]Cl_(2)+AgNO_(3) to 3AgCl 200xx0.01xx2=0.1xxV=40 mL`

Discussion

42.	Collision theory satisfactorilly explains for:
Answer» FIRST ORDER reactions Zero order reactions Bimolecular reactions Any order reactions Answer :C

Discussion

43.	Collision theory is most satisfactory for
Answer» FIRST order reaction SECOND order reaction BIMOLECULAR reaction any order reaction SOLUTION :Collisions THEORY is satisfactory for bimolecular reactions.

Discussion

44.	Co-ordination number of Co in [Co(NH_3)_6]^(2+) is:
Answer» 4 5 6 8 Answer :C

Discussion

45.	Collision theory is applicable to….
Answer» FIRST ORDER reactions zero order reactions bimolecular REACTION INTRA molecular reactons Answer :C

Discussion

46.	Collision Theory is applicable to
Answer» FIRST ORDER REACTIONS Zero order reactions BIMOLECULAR reactions Intramolecular reactions Solution :( C ) : Bimolecular reactions

Discussion

47.	Co-ordination number of cations in rock salt structure of NaCl is :
Answer» 4 6 8 9 Answer :B

Discussion

48.	Collin's reagent is used to convert
Answer» `-CH_(2)OHtoCHO` `-CHOto-CHO` `-CHOto-CH_(2)OH` SOLUTION :collin's REAGENTS is USED to CONVERT `-CH_(2)OH to -CHO`

Discussion

49.	{:("Co-ordination entity","Wave length of light"),(,"absorbed(nm)"),([CoCol(NH_(3))_(5)]^(2+),""P),([CoCol(NH_(3))_(5)(H_(2)O)]^(3+),""Q),([Co(NH_(3))_(6)]^(3+),""R),([Co(CN)_(6)]^(3+),""S),([Cu(H_(2)O)_(4)]^(2+),""T):}
Answer» <P>`P gt R gt Q` `T gt P gt Q gt R gt S` `P gt Q gt R` `T gt Q gt P gt R gt S` SOLUTION :`Delta_(0)PROP(1)/(LAMBDA)`

Discussion

50.	Collin's reagent is
Answer» `MNO_(2)//HCl` `MNO_(4)//C_(2)H_(5)N` `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)` `Cr_(2)O_(3)//2C_(5)H_(5)N` Answer :D

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Colloidal solution of gold prepared by different methods of different colours because of :

Colloidal solution of ink is prepared by

Colloidal solution of gold prepared by different methods have different colours, because

Colloidal solution is

Colloidal solution commonly used in the treatment of eye disease is

Colloidal solution can be made in water and in air as media. What distinctive names are given to these two types of sols ?

Colloidal sols which can be prepared ddirectly by micing a substance with the dispersiion medium are called………..

Colloidal sols are not purified by

Colloidal sol is :

Colloidal sol found effective in treating eye disease is

Colloidal particles always carry an electric charge which of the following statements is true ?

Colloidal particle present in colloidal solution are good adsorber. Why ?

Colloidal ink and graphite are prepared by ......

Colloidal milk of magnesia is used

Colloidal graphite is prepared by____ method.

Colloidal gold sol can be preared by the reduction of soluble salt solution such as AuCl_3 with

Colloidal gold is given by injection to act as:

Colloidal dispersion of a liquid in a gas is called……….

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

Colloid is which type of system?

Collodion is a 4% solution of which one of the following compounds in alcohol - ether mixture?

Colloid form by addition of excess amount of KI in AgNO_(3) solution is of ......... type.

Co^(2+)(aq.)+SCN^(-) (aq.) to "Complex"(X) Ni^(2+)(aq.) +"Dimethylglyoxime" overset(NH_(4)OH) to "Complex"(Y) The coordination number of cobalt and nickel in complexes X and Y are four. The IUPAC name of the complexes (X) and (Y) are respectively :

Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?

Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X). Ni^(2+)(aq)+"Dimethylglyoxime" overset(NH_(4)OH) to "Complex" (Y). The coordination number of cobalt and nickel in complexes X and Y are four. Select the correct statement for the complexes (X) and (Y).

Collodion is a 4% solituon of which one of the following in alcohol-enter mixture ?

Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X). Ni^(2+)(aq)+"Dimethylglyoxime" overset(NH_(4)OH) to "Complex" (Y). The coordination number of cobalt and nickel in complexes X and Y are four. The geometry of complexes (X) and (Y) are respectively :

Collodion is 4% solution of ........... in a mixture of ........

Co^(2+)(aq)+SCN^(-)(aq) to "complex" (X). Ni^(2+)(aq)+"Dimethylglyoxime" overset(NH_(4)OH) to "Complex" (Y). The coordination number of cobalt and nickel in complexes X and Y are four. The IUPAC names of the complexes (X) and (Y) are respectively.

Colloddal particles exhibit Tyndall ellect due to:

CO_2 and N_2 are non-supporters of combustion . However, for putting out fires CO_2 is preferred over N_2 because CO_2:

Collision theory was proposed by.........in 1916 and .......in 1918.

CO_(2) and N_(2) are non-supporters of combustion. However for putting our fires CO_(2) is preferred over N_(2) because CO_(2)

Co-polymer is:

CO reacts with chlorine in presence of sunlight to give :

Co-polymer is not:

Collision theory satisfactorily explains

Co-polymer is

Co-ordination number of platinum [Pt(NH_(3))_(4)Cl_(2)]^(2+)

Coordination number of Cr is 6. A complete entity with C_(2)O_(4)^(-2), en superoxide as ligands is [Cr(C_(2)O_(4))_(x)(en)_(y)(O_(2))_(z)]^(+). The ratio of x: y : z is

Co-ordination number of Cr in CrCl_(3).5H_(2)O is six. The maximum volume of 0.1 N AgNO_(3) needed to precipitate the chlorinein outer sphere in 200ml of 0.01M solution of the complex is/are :

Collision theory satisfactorilly explains for:

Collision theory is most satisfactory for

Co-ordination number of Co in [Co(NH_3)_6]^(2+) is:

Collision theory is applicable to….

Collision Theory is applicable to

Co-ordination number of cations in rock salt structure of NaCl is :

Collin's reagent is used to convert

{:("Co-ordination entity","Wave length of light"),(,"absorbed(nm)"),([CoCol(NH_(3))_(5)]^(2+),""P),([CoCol(NH_(3))_(5)(H_(2)O)]^(3+),""Q),([Co(NH_(3))_(6)]^(3+),""R),([Co(CN)_(6)]^(3+),""S),([Cu(H_(2)O)_(4)]^(2+),""T):}

Collin's reagent is