94420 + Interview Questions in Chemistry in Class 12

1.	The coenzymes are derived from :
Answer» VITAMINS LIPIDS HORMONES Carbohydrates. Answer :A

Discussion

2.	The coefficients x, y and z in the following balanced equation : xZn+yNO_(3)^(-)tozZn^(2+)+NH_(4)^(+) (in basic medium) are
Answer» `4,1,4` `2,2,2` `4,2,4` `4,4,4` ANSWER :A

Discussion

3.	The coefficient of viscosity of a solution and its solvent are respectively etaand eta_(0). The specific viscosity eta_(sp)may be expressed as:
Answer» `ETA/eta_(0)` `(eta-eta_(0))/eta_(0)` `(eta-eta_(0))/eta` `eta_(0)/eta` ANSWER :B

Discussion

4.	The CoCl_(2) lattice is
Answer» BODY centred cubic closed pack Body centred TETRAGONAL There are 16 formula units PER unit cell. The number of molecules which the basis consist is 2 Solution :Choice (a) is correct because in `CaCl_(2)` there is a body centred cubic closed packing. Choice (B) is correct because there is tetragonal body centre observed. Choice (c) is also correct because there are 16 `CaCl_(2)` present in one `CaCl_(2)` unit lattice.

Discussion

5.	The coal tar fraction which contains phenol is
Answer» MIDDLE OIL GREEN oil HEAVY oil LIGHT oil. Answer :A

Discussion

6.	The coal form containing maximum percentage of carbon is:
Answer» Lignite Anthracite Bituminous Peat Answer :B

Discussion

7.	The coagulation valus of the electrolytes AlCl_(3) and NaCl for As_(2)S_(3) sol are 0.093 and 52 respectively. How many times has AlCl_(3) greater coagulating power than NaCl ?
Answer» Solution :It may be noted that the coagulating POWERS of the electrolytes are inversely proportionsl to their coagulating VALUE. THUS, `("coagulating power of" AlCl_(3))/("Coagulating power of NaCl")=(52)/(0.093)=559` Thus, coagulating power of `AlCl_(3)` is 559 times more than that of NaCl.

Discussion

8.	The coagulation values of the electrolytes AlCl_3 and NaCl for As_2S_3 sol are 0.093 and 52 respectively. How many times AlCl_3 has greater coagulating power than NaCl
Answer» SOLUTION :It MAY be noted that the coagulating POWERS of the ELECTROLYTES are inversely proportional to their coagulating VALUES. Thus, `(Coagu lati ng power of AlCl_3)/(Coagu lati ng power of NaCl)=52/0.093=559` Thus, coagulating power of `AlCl_3` is 559 times more than that of NaCl.

Discussion

9.	The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_(2)S_(3) are given : I. (NaCl) = 52 II. (BaCl_(2)) = 0.69 "" III. (MgSO_(4)) = 0.22 Correct order of their coagulating power is
Answer» IgtIIgtIII IIgtIgtIII IIIgtIIgtI IIIgtIgtII Answer :C

Discussion

10.	The coagulation values of AICI_(3) and NaCI are 0.093 and 52 respectively . Then coagulating power of AICI_(3) as compared to that of NaCI is
Answer» `52xx0.093` times `52//0.093` times `0.093 //52` times `52-0.093` times Solution :`("COAGULATION power of NACI")/("Coagulation power of AICI"_(3))`

Discussion

11.	The coagulation values in millimolesper litreof the electrolytes used for the coagulation of AS_2S_3 are given below (I) (NaCl)=52 (II) (BaCl)=0.69 (III) (MgSO_4)=0.22 The correct orderof their coagulating poweris ................
Answer» `III GT II gt I ` `I gt II gt III` `I gt III gt II ` `II gt III gt I` Solution :`III gt II gt I` coagulating power `pm""(1)/(" COAGULATION VLAUE ")`

Discussion

12.	The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_(2)S_(3) are given below : I. (NCl) = 52 , II. (BaCl_(2)= 0.69 III. (MgSO_(4)) = 0.22 The correct order of their coagulating power is -
Answer» `III GT I gt II` `I gt II gt III` `II gt I gt III` `III gt II gt I` ANSWER :D

Discussion

13.	The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_(2)O_(3) are given below : I(NaCl)=52, II(BaCl_(2))=0.69,III (MgSO_(4))=0.22 The correct order of their coaguolating power is
Answer» `III GT II gt I` `IIII gt I gt II` `I gt II gt III` `II gt Igt III` Solution :Coagulating POWER `prop (1)/("Coagulation value")` Hence, the order is `III gt II gt I.`

Discussion

14.	The coagulation value in millimoles per litre of the electrolyes used for the coagulation of As_(2)S_(3) are given below: I. (NaCl)=52 ,II. (BaCl_(2))=0.69 III. (MgSO_(4))=0.22 The correct order of their coagulating power is
Answer» III GT I gt II I gt II gt III II gt I gt III III gt II gt I Answer :D

Discussion

15.	The coagulation values in milimoles per litre of the electrolytes used for the coagulation of As_(2)S_(3) are given below : (I) NaCl=52 (II) BaCl_(2)=0.69 (III) MgSO_(4)=0.22 The correct order of their coagulating power is
Answer» III gt II gtI III gt I gt II I gt II gt III II gt I gt III Solution :COAGULATION POWER `prop (1)/("Coagulation VALUE") So, the order is III > II > I

Discussion

16.	The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_2 S_3are given below (I) (NaCl) = 52 (II) (BaCl_2) = 0.69 (III) (MgSO_4) = 0.22 The correct order of their coagulating power is
Answer» `IIIgtIIgtI` `IgtIIgtIII` `IgtIIIgtII` `IIgtIIIgtI` Solution :Hint : COAGULATING POWER `+-(1)/("COAGULATION VALUE")`

Discussion

17.	The coagulation power of an effective ion carrying the charge opposite to the sol particles has been illustrated by
Answer» Brownian MOVEMENT GOLD number Tyndal effect Hardy-Schulz rule Answer :D

Discussion

18.	The coagulation power of an electrolyte for arsenous suphide sol is maximum for :
Answer» `AlCl_3` `Na_3PO_4` `K_4[FE(CN)_6]` `HCL` ANSWER :A

Discussion

19.	The coagulation of colloidal particles of the sol can be caused by
Answer» HEATING ADDING oppositely CHARGED sol Adding ELECTROLYTE All the above ANSWER :D

Discussion

20.	The coagulation of 100ml gold sol is completely prevented by adding 0.25g of starch to it before adding 10ml of 10% NaCl solution. Calculate the gold number of starch.
Answer» Solution :10ml of 10% NaCl solution is added to 100ml of gold SOL. THUS, 1ml of 10% NaCl has been added to each 10ml of gold sol. Weight of starch REQUIRED for 100ml gold sol=0.25g =250MG and in 10ml sol=25mg. Gold number of starch =25.

Discussion

21.	For the coagulation of 100ml of a positive sol 10mlof 1M sodium chloride is required. Calculate the flocculation value.
Answer» 0.365 36.5 100 200 SOLUTION :`200 RARR 0.73 gr : 1000 rarr ? ` 3.65 gr of HCI=0.1 mole = 100 MILLI mole

Discussion

22.	The coagulation of 100 mL of a colloidal solution of gold is completely prevented by adding 0.25 g of starch to it before adding 10 mL of 10% NaCl solution. Find out the gold number of starch.
Answer» SOLUTION :10 mL of 10% NaCl solution is added to 100 mL of solution of gold. Thus, 1 mL of 10% NaCl solution has been added to 10 mL solution of gold. SINCE, 100 mL gold solution required = 0.25 g starch `=0.25xx10^(3)` mg starch So, 10 mL gold solution required `=(0.25 xx 10^(3))/(100)xx10` `=25 mg` starch Thus, by definition, the gold NUMBER of starch is 25.

Discussion

23.	The coagulation of 10 ml of colloidal solution of gold is completely prevented by addition of0.25 g of a substance "X"to it before addition of 1 mlof10% NaCl solution. The gold number of "X"is
Answer» ANSWER :250

Discussion

24.	The coagulation of 10 ml of gold sol is just prevented on adding 1 ml solution of 10% NaCl in the presence of 0.025 g of starch. The gold number of starch is:
Answer» `0.25` `0.025 ` `2.5 ` `250.` Solution :MILLIGRAMS of STARCH used `0.025 xx 1000= 25` MG`

Discussion

25.	The coagulation of 100 ml gold sol is completely prevented by adding 0.25 g of starch to it before adding 10 ml of 10% NaCl solution. Calculate the gold number of starch.
Answer» SOLUTION :GOLD no is EXPRESSED in m.GR = 0.005 gr = 5 m.gr

Discussion

26.	The coagulating power of electrolytes having ions Na^(+), Al^(3+) and Ba^(2+) for arsenic sulphide sol increases in the order :
Answer» `AL^(3+) LT BA^(2+) lt Na^(+)` `NA^(+) lt Ba^(2+) lt Al^(3+)` `Ba^(2+) lt Na^(2+) lt Al^(3+)` `Al^(3+) lt Na^(+) lt Ba^(+)` Solution :`NA^(+) lt Ba^(2+) lt Al6(3+)`

Discussion

27.	The coagulating power of an electrolyte for blood decrease in the order.
Answer» `Na^(+), AL^(+3), Ba^(+2)` `PO_(4)^(-3), SO_(4)^(-2), CL^(-)` `Al^(+3), Ba^(+2), Na^(+)` `Cl^(-),SO_(4)^(2-), PO_(4)^(-3)` Answer :C

Discussion

28.	The coagulating power of clcctrolytcs having inos Na ^(+), Al ^(3+) and Ba ^(2+) for arsenic culphide sol increase in the order :
Answer» `AL^(3+) lt Na^(+) lt Ba^(2+)` `Al^(3+) lt Ba^(2+) lt Na^(+)` `Na^(+) lt Ba^(2+) lt Al^(3+)` `Ba^(2+) lt Na^(+) lt Al^(3+)` ANSWER :C

Discussion

29.	The coagulating power of an electrolyte for arsenious sulphide decreases in the order
Answer» `Na^(+) gt AL^(3+) gt Ba^(2+)` `PO_4^(3-) gt SO_4^(2-) gt CL^(-)` `Cl^(-) gt SO_4^(2-) gt PO_4^(3-)` `Al^(3+) gt Be^(2+) gt Na^(+)` Answer :D

Discussion

30.	The coagulating power of an electrolyte for arsenious sulphide sol decreases in the order:
Answer» `Na ^(+) GT Al ^(3+) gt Ba ^(2+)` `PO _(4) ""^(3-) gt SO _(4)^(2-) gt Cl ^(-)` `Cl ^(-) gt SO _(4) ^(2-) gt PO _(4) ^(3-)` `Al ^(3+) gt Ba ^(2+) gt Na ^(+)` Solution :`As _(2) S _(3)` is a negative sol and therefore coagulating power DECREASES as `Al ^(3+) gt Ba ^(2+) gt Na ^(+)`

Discussion

31.	The coagulating power of an electrolyte for Aresenious sulphide sol decreases in the order
Answer» `Na^(+)gtAl^(3+)gtBa^(2+)` `PO_(4)^(3-)gtSO_(4)^(2-)GTCL^(-)` `CL^(-)gtSO_(4)^(2-)gtPO_(4)^(3-)` `Al^(3+)gtBe^(2+)gtNa^(+)` ANSWER :D

Discussion

32.	The co-ordination numbre of the metal in sodium nitro prusside is
Answer» Solution :`Na_(2)[Fe(CN)_5NO],` Co-ordination No = 6

Discussion

33.	The co-ordination number of the element M in the complex M(DMG)_(2) ( where DMG is dimethylglyoxime ?
Answer» SOLUTION :

Discussion

34.	The co-ordination number of the central ion may be obtained from:
Answer» The NUMBER of IONIC bonds FORMED with the surrounding atoms The number of Co-ordinate bonds formed with the surrounding atoms The number of ions of opposite CHARGE immediately surrounding the SPECIFIC ion None of the above Answer :B

Discussion

35.	The co-ordination number of Ni in [Ni(H_2O)_6]^(2+) complex is :
Answer» 2 4 6 5 Answer :C

Discussion

36.	The co-ordination number of Cu in Cu(NH_3)_4^(2+) is:
Answer» 4 5 3 6 Answer :A

Discussion

37.	The co-ordination number of Cu in copper ammonium sulphate is:
Answer» 2 4 3 6 Answer :B

Discussion

38.	The co-ordination number of Cr in [Cr(NH_3)_3(H_2O)_3]Cl_3 is:
Answer» 3 4 6 2 Answer :C

Discussion

39.	The co-ordination number of copper which crystallise in close-packed structure is…
Answer» 6 8 12 4 Answer :C

Discussion

40.	The co-ordination number of copper in the complex formed by adding excess of NH_3 to CuSO_4 solution is:
Answer» 4 2 6 5 Answer :A

Discussion

41.	The co-ordination number of cobalt in[Co(en)_2Br_2]Cl_2 is :
Answer» 2 4 6 8 Answer :C

Discussion

42.	The coordination number of cobalt in [Co(NH_(3))_(3)Cl_(3)] is
Answer» 6 5 4 3 Answer :A

Discussion

43.	The co-ordination number of Al in Al_(2)Cl_(6) is
Answer» ANSWER :4

Discussion

44.	The co-ordination number of a central metal atom in a complex is determined by :
Answer» the number of only ANIONIC ligands BONDED to metal ion the number of ligands around a metal ion bounded by pi bonds the number of ligands around a metal ion bondedby SIGMA and pi-bonds the number of ligands around a metal ion bonded by sigma bonds Answer :C

Discussion

45.	The co-ordination number of a metal crystallising in a hexagonal close paced structure is :
Answer» 12 4 8 6 Answer :A

Discussion

46.	The co-ordination number in ccp and hcp arrangement of metal atoms are respectively
Answer» 6,6 12,6 12,12 8,6 Solution :The coordination number in both ccp and HCP arrangement of METAL atoms is 12.

Discussion

47.	The co-ordination number and the oxidation state of the element .M. in the complex [M(en)_2(C_2O_4)] NO_2 {where (en) is ethan-1, 2-diamine} are respectively
Answer» 6 and 3 6 and 2 4 and 2 4 and 3 Solution :(a) For the GIVEN COORDINATE compound, `[M(en)_2(C_2O_4)]NO_2` (i) All the (3) lignnds are bi dented thus is coordinate NUMBER - 6 `X+0+2 xx (-2) = 0 -1` `THEREFORE` x(Oxidation number ofM) = +3 `therefore` Option (a) is the correct answer.

Discussion

48.	The co-ordination number and the oxidation state of the element 'M' in the complex [M(en)_2(C_2O_4)]NO_2 [where (en) is ethan-1, 2 diamine] are respectively
Answer» 6 and 3 4 and 3 6 and 2 4 and 2 ANSWER :A

Discussion

49.	The co-ordination number and the oxidation state of the element E in the complex. are respectively ?
Answer» 6 and 3 6 and 2 4 and 2 4 and 3 Solution :CN of E = 6 , OXIDATIOIN state of E(x) x + `2(0)` + - 2 = +1 x = +1 +2 = +3

Discussion

50.	The co-ordinationnumber and the oxidation state of an element 'E' in the complex [E(en)_(2)(C_(2)O_(4))]NO_(2) (where (en) is ethylene diamine), respectively are
Answer» 6 and 3 6 and 2 4 and 2 4 and 3 ANSWER :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The coenzymes are derived from :

The coefficients x, y and z in the following balanced equation : xZn+yNO_(3)^(-)tozZn^(2+)+NH_(4)^(+) (in basic medium) are

The coefficient of viscosity of a solution and its solvent are respectively etaand eta_(0). The specific viscosity eta_(sp)may be expressed as:

The CoCl_(2) lattice is

The coal tar fraction which contains phenol is

The coal form containing maximum percentage of carbon is:

The coagulation valus of the electrolytes AlCl_(3) and NaCl for As_(2)S_(3) sol are 0.093 and 52 respectively. How many times has AlCl_(3) greater coagulating power than NaCl ?

The coagulation values of the electrolytes AlCl_3 and NaCl for As_2S_3 sol are 0.093 and 52 respectively. How many times AlCl_3 has greater coagulating power than NaCl

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_(2)S_(3) are given : I. (NaCl) = 52 II. (BaCl_(2)) = 0.69 "" III. (MgSO_(4)) = 0.22 Correct order of their coagulating power is

The coagulation values of AICI_(3) and NaCI are 0.093 and 52 respectively . Then coagulating power of AICI_(3) as compared to that of NaCI is

The coagulation values in millimolesper litreof the electrolytes used for the coagulation of AS_2S_3 are given below (I) (NaCl)=52 (II) (BaCl)=0.69 (III) (MgSO_4)=0.22 The correct orderof their coagulating poweris ................

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_(2)S_(3) are given below : I. (NCl) = 52 , II. (BaCl_(2)= 0.69 III. (MgSO_(4)) = 0.22 The correct order of their coagulating power is -

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_(2)O_(3) are given below : I(NaCl)=52, II(BaCl_(2))=0.69,III (MgSO_(4))=0.22 The correct order of their coaguolating power is

The coagulation value in millimoles per litre of the electrolyes used for the coagulation of As_(2)S_(3) are given below: I. (NaCl)=52 ,II. (BaCl_(2))=0.69 III. (MgSO_(4))=0.22 The correct order of their coagulating power is

The coagulation values in milimoles per litre of the electrolytes used for the coagulation of As_(2)S_(3) are given below : (I) NaCl=52 (II) BaCl_(2)=0.69 (III) MgSO_(4)=0.22 The correct order of their coagulating power is

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_2 S_3are given below (I) (NaCl) = 52 (II) (BaCl_2) = 0.69 (III) (MgSO_4) = 0.22 The correct order of their coagulating power is

The coagulation power of an effective ion carrying the charge opposite to the sol particles has been illustrated by

The coagulation power of an electrolyte for arsenous suphide sol is maximum for :

The coagulation of colloidal particles of the sol can be caused by

The coagulation of 100ml gold sol is completely prevented by adding 0.25g of starch to it before adding 10ml of 10% NaCl solution. Calculate the gold number of starch.

For the coagulation of 100ml of a positive sol 10mlof 1M sodium chloride is required. Calculate the flocculation value.

The coagulation of 100 mL of a colloidal solution of gold is completely prevented by adding 0.25 g of starch to it before adding 10 mL of 10% NaCl solution. Find out the gold number of starch.

The coagulation of 10 ml of colloidal solution of gold is completely prevented by addition of0.25 g of a substance "X"to it before addition of 1 mlof10% NaCl solution. The gold number of "X"is

The coagulation of 10 ml of gold sol is just prevented on adding 1 ml solution of 10% NaCl in the presence of 0.025 g of starch. The gold number of starch is:

The coagulation of 100 ml gold sol is completely prevented by adding 0.25 g of starch to it before adding 10 ml of 10% NaCl solution. Calculate the gold number of starch.

The coagulating power of electrolytes having ions Na^(+), Al^(3+) and Ba^(2+) for arsenic sulphide sol increases in the order :

The coagulating power of an electrolyte for blood decrease in the order.

The coagulating power of clcctrolytcs having inos Na ^(+), Al ^(3+) and Ba ^(2+) for arsenic culphide sol increase in the order :

The coagulating power of an electrolyte for arsenious sulphide decreases in the order

The coagulating power of an electrolyte for arsenious sulphide sol decreases in the order:

The coagulating power of an electrolyte for Aresenious sulphide sol decreases in the order

The co-ordination numbre of the metal in sodium nitro prusside is

The co-ordination number of the element M in the complex M(DMG)_(2) ( where DMG is dimethylglyoxime ?

The co-ordination number of the central ion may be obtained from:

The co-ordination number of Ni in [Ni(H_2O)_6]^(2+) complex is :

The co-ordination number of Cu in Cu(NH_3)_4^(2+) is:

The co-ordination number of Cu in copper ammonium sulphate is:

The co-ordination number of Cr in [Cr(NH_3)_3(H_2O)_3]Cl_3 is:

The co-ordination number of copper which crystallise in close-packed structure is…

The co-ordination number of copper in the complex formed by adding excess of NH_3 to CuSO_4 solution is:

The co-ordination number of cobalt in[Co(en)_2Br_2]Cl_2 is :

The coordination number of cobalt in [Co(NH_(3))_(3)Cl_(3)] is

The co-ordination number of Al in Al_(2)Cl_(6) is

The co-ordination number of a central metal atom in a complex is determined by :

The co-ordination number of a metal crystallising in a hexagonal close paced structure is :

The co-ordination number in ccp and hcp arrangement of metal atoms are respectively

The co-ordination number and the oxidation state of the element .M. in the complex [M(en)_2(C_2O_4)] NO_2 {where (en) is ethan-1, 2-diamine} are respectively

The co-ordination number and the oxidation state of the element 'M' in the complex [M(en)_2(C_2O_4)]NO_2 [where (en) is ethan-1, 2 diamine] are respectively

The co-ordination number and the oxidation state of the element E in the complex. are respectively ?

The co-ordinationnumber and the oxidation state of an element 'E' in the complex [E(en)_(2)(C_(2)O_(4))]NO_(2) (where (en) is ethylene diamine), respectively are