94420 + Interview Questions in Chemistry in Class 12

1.	CN^(-), SCN^(-) and N_(3)^(-) are called............ .
Answer» SOLUTION :pseudohalogens

Discussion

2.	CN^- is a strong field ligand. This is due to the fact that
Answer» it can ACCEPT ELECTRON from metal species it forms HIGH SPIN complexes with metal species it carries negative charge none of the above Answer :D

Discussion

3.	Colligative properties are observed when ______
Answer» a non-VOLATILE SOLID is DISSOLVED in a volatile LIQUID. a non-volatile liquid is dissolved in another volatile liquid. a gas is dissolved in non volatile liquid. a volatile liquid is dissolved in another volatile liquid. Solution :A non-volatile solid is dissolved in a volatile liquid.A non-volatile liquid is dissolved in another volatile liquid.

Discussion

4.	CMC value for soap is .........
Answer» `10^(-4)" to "10^(-2)" mol/L"` `10^(-3)" to "10^(-2)" mol/L"` `10^(-4)" to "10^(-3)" mol/L"` `10^(-3)" to "10^(-1)" mol/L"` SOLUTION :`10^(-4)" to "10^(-3)" mol/L"`

Discussion

5.	Clouds represent an example of dispersion of
Answer» GAS in SOLID SALID in gas Gas in gas LIQUID in gas. Answer :D

Discussion

6.	Collidal solutios of gold prepared by different methods are of different colours because of
Answer» DIFFERENT diameters of colloidal gold particles Variable valency of gold Different CONCENTRATIONS of gold particles IMPURITES produced by different methods Solution :N//A

Discussion

7.	Cloud or fog is an example of colloidal system of:
Answer» LIQUID DISPERSED in gas gas dispersed in gas solid dispersed in gas solid dispersed in liquid Answer :A

Discussion

8.	Collidal dispersion have been classified into different types depending upon the physical state of the dispersed phases and the dispersion medium. They are prepared in the industry or in the laboratory by a number of methods and then purified. The protective action of lyophilic colloids was studied by Zsigmondy and he introduced a term called gold number. Which of the following does not form a lyophilic colloid?
Answer» Rubber DISSOLVED in benzene. WHITE or the EGG dissolved into water. Common salt ADDED into benzene. Stannous CHLORIDE solution added to gold chloride solution. Solution :`SnCl_(2)+AuCl_(3)` react to from gold sol which is a lyophobic sol.

Discussion

9.	Collectively the elements of group 15 are called
Answer» pnicogens pnicopens nicopen none of these Solution :COLLECTIVELY these ELEMENTS are CALLED pnicogens and their COMPOUND pniconides.

Discussion

10.	Collegative property among the following is
Answer» OSMOTIC pressure same VAPOUR pressure same MELTING POINT viscosity Answer :A

Discussion

11.	Close packing is maximum in the crystal which is a:
Answer» SIMPLE CUBE face-centred cube body-centred cube primitive cube Answer :B

Discussion

12.	Collagen is a example of
Answer» carbohydrates oils fats proteins Answer :D

Discussion

13.	Colemanite is a mineral of :
Answer» B Mg Al Mn Answer :A

Discussion

14.	Close packing is maximum in the crystal which is
Answer» SIMPLE cubic bcc fcc All Solution :CLOSE PACKING is maximum in fcc ( 74%) , bcc ( 68^), simple cubic ( 52.36)

Discussion

15.	Colemanite is a mineral of
Answer» Mn B Al Mg Answer :D

Discussion

16.	Close packing is maximum in the crystal which is -
Answer» SIMPLE cube Face CENTRED cube Body centred cube none Answer :B

Discussion

17.	Cold ferrous sulphate solution on abosorption of no develops brown colour dur to the formation of
Answer» PARAMAGNETIC `[Fe(H_(2)O)_(5)(NO)]SO_(4)` diamagnetic `[Fe(H_(2)O)_(5)(N_(3)]SO_(4)` paramagnetic `[Fe(H_(2)O)_(5)(NO_(3))](SO_(4))_(2)` diamagnetic `[Fe(H_(2)O)_(4)(SO_(4))]NO_(3)` SOLUTION :Borwn ring is `[Fe(H_(2)O)_(5)(NO)]SO_(4)`

Discussion

18.	Close packing is maximum in the crystal-
Answer» Simple CUBIC FACE CENTRED Body centred NONE of these Answer :B

Discussion

19.	Clomel may be freed from traces of metallic mercury by washing with :
Answer» DIL.`HNO_3` Dil.`H_2SO_4` WATER AQUA - REGIA ANSWER :A

Discussion

20.	Cold ferrous sulphate solution on absorption of NO develops brown colour due to the formation of
Answer» paramagnetic `[Fe(H_(2)O)_(5)(NO)]SO_(4)` diamagnetic `[Fe(H_(2)O)_(5)(N_(3))]SO_(4)` paramagnetic `[Fe(H_(2)O)_(5)(NO_(3))](SO_(4))_(2)` diamagnetic `[Fe(H_(2)O)_(4)(SO_(4))]NO_(3)` SOLUTION :Brown ring is `[Fe(H_(2)O)_(5)(NO)]SO_(4)`

Discussion

21.	Calomel may be freed from traces of metallic mercury by washing with :
Answer» `dil.HNO_3` `dil.H_2SO_4` WATER AQUAREGIA ANSWER :A

Discussion

22.	Colemanite is :
Answer» `Na_(2)B_(4)O_(7).10H_(2)O` `Na_(2)B_(6)O_(11).5H_(2)O` `NaBO_(2)` `H_(3)BO_(4)` SOLUTION :Colemanite is ORE of boron with formula `Na_(2)B_(6)O_(11).5H_(2)O`.

Discussion

23.	Cold dilute nirtic acid would dissolved how many of the following without significant evolution of any gas: Pb,Mg,Sb, Au, Ag,Fe, Mn, Sn,P_(4)
Answer» SOLUTION :NO is EVOLVED with Pb, SB, Ag `P_(4)` `NH_(4)NO_(3)` is formed and no gas is evolved with Mg, Fe, Mn, Sn. No reaction with AU

Discussion

24.	ClO_4^- is the strongest base.is it true or false?
Answer» SOLUTION :WEAKEST BASE

Discussion

25.	Cold dilute NaOH react with Cl_2 gives
Answer» `NAOCL` `NaClO_(3)` `Na_(2)O_(2)` NaO Answer :A

Discussion

26.	Cold dil. H_(2)SO_(4) will completely dissolve : (i) Pb (ii) Fe_(3)O_(4) (iii) Fe (iv) Cu (v) Mg (vi) MgO (vii) CoCO_(3) (viii) CuCO_(2) (ix) SrCO_(3)
Answer» ANSWER :6(EXCEPT i, IV and IX)

Discussion

27.	Clock pendulums are made from :
Answer» Brass Invar Solder GERMAN SILVER ANSWER :B

Discussion

28.	ClO_4^- ion is:
Answer» Tetrahedral Angular Pyramidal None Answer :A

Discussion

29.	ClO_(3)^(-)reacts with I_2 to form…………….
Answer» `ClO_(4)^(-)` Icl and `O_(2)` Icl and `O_(3)` `IO_(3)^(-)` and `Cl_(2)` SOLUTION :`ClO_(3)^(-) + I_(2) to Cl_(2) + 2lO_(3)^(-)`

Discussion

30.	ClO_3^- ion is:
Answer» Angular Pyramidal Tetrahedral None Answer :B

Discussion

31.	Cold dilute alkaline KMnO_(4) is known as ………
Answer» SOLUTION : Baeyer.s REAGENT

Discussion

32.	ClO_2 reacts with O_2 to give
Answer» `Cl_(2)O_(4)` `Cl_(2)O` `Cl_(2)O_(6)` `ClO_(4)` Solution :`Cl_(2)O_(6)` is formed by the reaction of `ClO_(2)` and `O_(3)`.

Discussion

33.	Coke is used in metallurgy chiefly as :
Answer» Flux Reducing AGENT Slag NONE of these ANSWER :B

Discussion

34.	ClO_2 is an/a
Answer» ANHYDRIDE of `HClO_2` anhydride of `HClO_3` MIXED anhydride of `HClO_2 and HClO_3` mixed anhydride of `HClO_3 and HClO_4` ANSWER :C

Discussion

35.	Coke is obtained from coal by:
Answer» Cracking Fractional distillation Destructive distillation None of the above Answer :C

Discussion

36.	ClO_2^- ion is:
Answer» Angular Pyramidal Tetrahedral None Answer :A

Discussion

37.	Coke is used in metallurgical process process chiefly as
Answer» flux reducing AGENT slag oxidising agent ANSWER :B

Discussion

38.	ClO_(2) in an anhydride of
Answer» CHLORINE ACID `(HClO_(3))` Mixed anhydride of `HClO_(2)` and `HClO_(3)` CHLOROUS acid `(HClO_(2))` NONE of the above Answer :B

Discussion

39.	Coke is used in metallurgical process chiefly as :
Answer» flux reducing AGENT SLAG oxidising agent Answer :B

Discussion

40.	Cl(g)+Cl(g) toCl_(2)(g). What will be the sign of DeltaH and DeltaS in this reaction?
Answer» SOLUTION :`DeltaH=-ve and DeltaS=-ve`.

Discussion

41.	Coinagemetalsare______
Answer» normalmetals TRANSITIONMETALS ACTIVEMETALS ALKALIMETALS ANSWER :B

Discussion

42.	ClF_(3) molecule has a T-shaped structure and not a trigonal planar one. Why ?
Answer» Solution :(i) In `ClF_(3)`, central atom Cl has three bond pairs and two lone pairs. (ii) According to VSEPR THEORY, the two lone pairs will OCCUPY. The equatorialpositions to `ul("minimise")` lp-lp and lp-lp REPULSIONS. (III) In addition, the axial FLUORINE atoms will be bent towards the equatorialfluorine in order to minimise the lp-lp repulsions. (iv) Therefore `ClF_(3)` has a bent T-shaped structure.

Discussion

43.	ClF_(3) exists but FCl_(3) does not. Why ?
Answer» Solution :Because F does not SHOW OXIDATION state other than – 1.

Discussion

44.	Clevite mineral is a rich source of helium. Why?
Answer» Solution :During radioactive decay, alpha PARTICLES are GENERALLY emitted. These particles change to HELIUM gas. Molecules of helium are occluded on the surface of the mineral

Discussion

45.	Coinage alloy has the composition of:
Answer» Ag+Cu+Ni Au+Ag+Cu Au+Zn+Ag Ag+Fe+Cu Answer :A

Discussion

46.	Clemmenson reduction is carried out with
Answer» `H_(2)//Pd` `NH_(2),NH_(2)`, followed by treatment with glycolicKOH `LiAlH_(4)` in ETHER `ZN(HG) /HCl` Answer :D

Discussion

47.	Coinage alloy contains copper. The other metal present may be
Answer» Fe Ni Zn Pt Answer :B

Discussion

48.	In clemmensen reduction aldehyde changes into
Answer» ANSWER :T

Discussion

49.	Clemmensen reduction of a ketone is carried out in presence of
Answer» `H_(2)` with PD as catalyst `NH_(2)NH_(2). H_(2)O // "glycol with KOH"` `LiAlH_(4)` in ether Zn – Hg and HCL. Solution :CLEMMENSEN reduction is carried out with Zn-Hg and HCl.

Discussion

50.	CO_((g))+H_(2(g))overset([x])rarrHCHO_((g))the catalyst x in above reaction is ..........
Answer» `FE` `Cu//ZbO-Cr_(2)O_(3)` `Cu` `NI` ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

CN^(-), SCN^(-) and N_(3)^(-) are called............ .

CN^- is a strong field ligand. This is due to the fact that

Colligative properties are observed when ______

CMC value for soap is .........

Clouds represent an example of dispersion of

Collidal solutios of gold prepared by different methods are of different colours because of

Cloud or fog is an example of colloidal system of:

Collectively the elements of group 15 are called

Collegative property among the following is

Close packing is maximum in the crystal which is a:

Collagen is a example of

Colemanite is a mineral of :

Close packing is maximum in the crystal which is

Colemanite is a mineral of

Close packing is maximum in the crystal which is -

Cold ferrous sulphate solution on abosorption of no develops brown colour dur to the formation of

Close packing is maximum in the crystal-

Clomel may be freed from traces of metallic mercury by washing with :

Cold ferrous sulphate solution on absorption of NO develops brown colour due to the formation of

Calomel may be freed from traces of metallic mercury by washing with :

Colemanite is :

Cold dilute nirtic acid would dissolved how many of the following without significant evolution of any gas: Pb,Mg,Sb, Au, Ag,Fe, Mn, Sn,P_(4)

ClO_4^- is the strongest base.is it true or false?

Cold dilute NaOH react with Cl_2 gives

Cold dil. H_(2)SO_(4) will completely dissolve : (i) Pb (ii) Fe_(3)O_(4) (iii) Fe (iv) Cu (v) Mg (vi) MgO (vii) CoCO_(3) (viii) CuCO_(2) (ix) SrCO_(3)

Clock pendulums are made from :

ClO_4^- ion is:

ClO_(3)^(-)reacts with I_2 to form…………….

ClO_3^- ion is:

Cold dilute alkaline KMnO_(4) is known as ………

ClO_2 reacts with O_2 to give

Coke is used in metallurgy chiefly as :

ClO_2 is an/a

Coke is obtained from coal by:

ClO_2^- ion is:

Coke is used in metallurgical process process chiefly as

ClO_(2) in an anhydride of

Coke is used in metallurgical process chiefly as :

Cl(g)+Cl(g) toCl_(2)(g). What will be the sign of DeltaH and DeltaS in this reaction?

Coinagemetalsare______

ClF_(3) molecule has a T-shaped structure and not a trigonal planar one. Why ?

ClF_(3) exists but FCl_(3) does not. Why ?

Clevite mineral is a rich source of helium. Why?

Coinage alloy has the composition of:

Clemmenson reduction is carried out with

Coinage alloy contains copper. The other metal present may be

In clemmensen reduction aldehyde changes into

Clemmensen reduction of a ketone is carried out in presence of

CO_((g))+H_(2(g))overset([x])rarrHCHO_((g))the catalyst x in above reaction is ..........