94420 + Interview Questions in Chemistry in Class 12

1.	Formation of ethylene from ethyl bromide is a case of :
Answer» ADDITION reaction Substitution reaction Elimination reaction Rearrangement reaction Answer :C

Discussion

2.	Formation of free radical in food material is protected by adding
Answer» Dulacin alitame BHT sucralose Answer :C

Discussion

3.	Formation of ester from alkyl halide and RCOOAg is,
Answer» ELECTROPHILIC SUBSTITUTION NUCLEOPHILIC substitution electrophilic addition nucleophilic addition Answer :B

Discussion

4.	Formation of distributed derivaties from mono substituted benzene results the following number of isomers
Answer» One Three Two Four Answer :B

Discussion

5.	Formation of diethyl ether from ethanol is based on a
Answer» DEHYDRATION reaction Dehydrogenation reaction Hydrogenation reaction Heterolytic FISSION reaction Solution :Dehydration of ALCOHOL GIVES ETHERS.

Discussion

6.	Formation of diethyl ether from ethanol is based on a :
Answer» DEHYDROGENATION reaction Hydrogenation reaction Dehydration reaction Heterolytic FISSION reaction Answer :C

Discussion

7.	Formation of complex compound can be detected by:
Answer» Change in COLOUR Change in SOLUBILITY Change in.pH All are CORRECT ANSWER :C

Discussion

8.	Formation of coloured solution is possible when metal ion in the compound contain
Answer» lone pair of electrons UNPAIRED electrons paired electrons none of these. Solution :For the formation of coloured solution, metal ION in the compound should CONTAIN unpaired electrons.On absorbing visible LIGHT, unpaired electrons.On absorbing visible light, unpaired electron can jump FORM ground state to the excited state.The transmitted and reflected light appears coloured and gives colour to compound.

Discussion

9.	Formation of complex compound can be detected by
Answer» (a) CHANGE in colour (B) Change in solubility (c) Change in PH (d) Change in electrical conductivity Solution :FORMATION of complex compound can be detected by. Change in color, solubility, pH, electrical conductivity.

Discussion

10.	Formation of chlorobenzene from benzene diazonium salts in presence of CuCl/HCl is called
Answer» Wurtz-fitting REACTION. Wurtz reaction Sandmeyer reaction Gatterman reaction Solution :Formation of CHLOROBENZENE from benzne DIAZONIUM SALT is called sundmeyer.s reaction.

Discussion

11.	Formation of cheese from milk is not
Answer» denaturation breaking of HYDROGEN bond breaking of IONIC bond breaking of PEPTIDE bond Answer :D

Discussion

12.	Formation of but-2-ene as major product by dehydration of butan-2-ol is according to ___________.
Answer» MARKOWNIKOFF's rule SAYTZEFF rule Steric EFFECT Anti-Markownikoff's rule Answer :B

Discussion

13.	Formation of bromobenzene from benzenediazonium chloride on treatment with CuBr/HBr is called _____reaction.
Answer» SOLUTION :SANDMEYER REACTION.

Discussion

14.	Formation of amylene oxide ring in glucose is an indication that ring in glucose is at:
Answer» `C_1` and `C_5` `C_2` and `C_5` `C_3` and` C_6` `C_2` and`C_4` ANSWER :A

Discussion

15.	Formation of alkene by removal of water molecule from alcohol is called ...... of alcohol.
Answer» Hydration DEHYDRATION Oxidation Reduction Solution :Dehydration

Discussion

16.	Formation of alkane by the action of Zn on alkyl halide is called:
Answer» WURTZ REACTION Kolbe.s reaction CANNIZZARO. s reaction Frankland.s reaction Answer :D

Discussion

17.	Formation of alkane by the action of Zn on alkyl halide is called-
Answer» Frankland reation Cannizzaro's reaction Wurtz reaction Kolbe's reaction Answer :A

Discussion

18.	Formation of acetaldehyde from ethanol is known as
Answer» OXIDATION SUBSTITUTION ADDITION REDUCTION ANSWER :A

Discussion

19.	Formation of alkane by the action of zinc on alkyl halide is called :
Answer» Frankland REACTION KOLBE's reaction WURTZ reaction CANNIZZARO's reaction ANSWER :A

Discussion

20.	Formation of a solution from two components can be considered as (1). pure solventtoseparated solvennt molecules, DeltaH_(1) (2). Pure solute toseparated solute molecules, DeltaH_(2) (3). Separated solvent and solute moleculestosolution, DeltaH_(3) Solution so formed will be ideal if
Answer» `DeltaH_("SOLN")=DeltaH_(1)-DeltaH_(2)-DeltaH_(3)` `DeltaH_("soln")=DeltaH_(3)-DeltaH_(1)-DeltaH_(2)` `DeltaH_("soln")=DeltaH_(1)+DeltaH_(2)+DeltaH_(3)` `DeltaH_("soln")=DeltaH_(1)+DeltaH_(2)+DeltaH-DeltaH_(3)` SOLUTION :For IDEAL solution, `DeltaH_("solution")=DeltaH_(1)+DeltaH_(2)+DeltaH_(3)`

Discussion

21.	Formation of a solution from two components can be considered as (i) pure solvent rarr separated solvent molecules, DeltaH_(1) (ii) pure solute rarr separated solute molecules, DeltaH_(2) (iii) separated solvent and solute molecules rarr solution, DeltaH_(3). Solutionso formed will be ideal if
Answer» `DeltaH_("soln")=DeltaH_(1)+DeltaH_(2)+DeltaH_(3)` `DeltaH_("soln")=DeltaH_(1)+DeltaH_(2)-DeltaH_(3)` `DeltaH_("soln")=DeltaH_(1)-DeltaH_(2)-DeltaH_(3)` `DeltaH_("soln")=DeltaH_(3)-DeltaH_(1)-DeltaH_(2)` Solution :If NET `DeltaH_("soln")` is the SUM of three steps, this means that solute-solvent interactions are SIMILAR to solvent-solvent and solute-solute interactions.

Discussion

22.	Formation of acetaldehyde from ethanol is called:
Answer» Addition Reducation Oxidation Substitution Answer :C

Discussion

23.	Formation of a solution from two componenets can be considered as : (i) pure sovent rarr separated solvent molecules, /_\H_(1) (ii) Pure solute rarrseparated molecules,/_\H_(2)(iii) separated sovent andsolute moleculesrarrsolution, /_\H_(3) solution so formed will be ideal if :
Answer» `DeltaH_("SOLN") = DeltaH_(3)- DeltaH_(1)-DeltaH_(2)` `DeltaH_("soln") = DeltaH_(1) +DeltaH_(2)+DeltaH_(3)` `DeltaH_("soln") = DeltaH_(1) +DeltaH_(2)-DeltaH_(3)` `DeltaH_("soln") = DeltaH_(1)-DeltaH_(2)-DeltaH_(3)` Solution :According to HESS' law `DeltaH_("soln") = DeltaH_(1) +DeltaH_(2) + DeltaH_(3)`.

Discussion

24.	Formation of a bridge bond is best explained by molecular orbital theory. According to which a bridge bond is formed by filling electrons into molecular orbital which spread over three nuclei hence such bonds are speciified as three centered bond. Q. In which of the following compound hybridization of bridging atom is differennt from hybridisation of central atom:
Answer» `Al_(2)(NH_(2))_(6)` `I_(2)Cl_(6)` Solid `BeCl_(2)` `Al_(2)(OH)_(6)` ANSWER :B

Discussion

25.	Formation of a bridge bond is best explained by molecular orbital theory. According to which a bridge bond is formed by filling electrons into molecular orbital which spread over three nuclei hence such bonds are speciified as three centered bond. Q. Which of the following compound is having number of atoms in same plane?
Answer» `Al_(2)Me_(6)` `B_(2)H_(6)` `Be_(2)H_(4)` `C_(3)H_(4)` ANSWER :A

Discussion

26.	Formation of a bridge bond is best explained by molecular orbital theory. According to which a bridge bond is formed by filling electrons into molecular orbital which spread over three nuclei hence such bonds are speciified as three centered bond. Q. In which of the following dimer emtpy atomic orbit of central atom of monomer does not involve in hybridization:
Answer» `Ga_(2)H_(6)`<BR>`Al_(2)Br_(6)` `Be_(2)H_(4)` `Cl_(2)O_(6)` ANSWER :D

Discussion

27.	Formation of 1^@ and secondary structure of proteins involves inkages
Answer» PEPTIDE LINKAGE, H-BOND H-Bond, DISULPHIDE bond Disulphide bond, peptide linkage H-bond, H-bond Answer :A

Discussion

28.	Formation ether from ethanol based on
Answer» dehydration hydrogenation dehydrogenation hydration Answer :A

Discussion

29.	Formality unit is used in which scientific field ?
Answer» PHARMACY MEDICAL AGRICULTURE (A) and (B) both ANSWER :D

Discussion

30.	Formationfo alkane by actionofZinc and alkyl haide called :
Answer» WURTZ REACTION Frankland reaction KOLBE's reaction CLEMMENSEN reaction Answer :B

Discussion

31.	The formation of cyanohydrin from a ketone is an example of
Answer» eelectrophilic addition nucleophilic addition ELECTROPHILIC substitutio nucleophilic substitution ANSWER :B

Discussion

32.	Formalin is a 40% aqueous solution of :Methanol,Ethanol,Methanal,Ethanal.
Answer» Methanol Ethanol Methanal Ethanal Answer :C

Discussion

33.	Formalin is an aqueous solution of :
Answer» FORMIC ACID Formaldehyde Fluorescein Furfuraldehyde Answer :B

Discussion

34.	Formalin is a
Answer» `100%` SOLUTION of HCHO `40%` solution of HCHO `60%` solution of HCHO `40%` solution of `CH_(3)COOH` ANSWER :B

Discussion

35.	Formalin is 40% aqueous solutions of
Answer» METHANAL Methanoic ACID METHANOL METHANAMINE ANSWER :A

Discussion

36.	Formalin is:
Answer» Formaldehyde Formaldehyde + METHANOL Formaldehyde + methanol + water Formaldehyde + water Answer :C

Discussion

37.	Formalin is
Answer» `HCHO` `CH_(3)CHO` `HCOOH` `CH_(3)COOH` Solution :FORMALIN is a solution of FORMALDEHYDE.

Discussion

38.	Formalin is 40% aqueous solution of
Answer» Methanal Methanoic acid Methanol Methanamine Answer :A

Discussion

39.	Formalin is 40% aqueous solution of :
Answer» METHANAL Methanoic acid Methanol Methanamine SOLUTION :(IX) (a) Methanal

Discussion

40.	Formaldehyde when treated with KOH gives methanol and potassium formate. The reaction is known as :
Answer» PERKIN's REACTION Claisen reaction CANNIZZARO's reaction Knoevenagel reaction ANSWER :C

Discussion

41.	formaldehyde when treated with conc.KOH gives
Answer» `CH_3CHO` `C_2H_4` `CH_3OH`,HCOOK `CH_3OH`, `CH_3CHO` ANSWER :C

Discussion

42.	Formaldehyde undergoes Cannizzaro's reaction while acetaldehyde gives aldol condensation. Explain.
Answer» Solution :Formaldehyde has no `ALPHA`-HYDROGEN ATOM while acetaldehyde has.

Discussion

43.	Formaldehyde to ethanol
Answer» SOLUTION :FORMALDEHYDE to ETHANOL :

Discussion

44.	Formaldehyde reacts with NH_3 to give
Answer» hexamethylenetetramine formaldehyde ammonia formalin hydrobenzamide Answer :A

Discussion

45.	Formaldehyde reacts with NH_(3) to form urotropine which has the composition
Answer» `(CH_(2))_(5)N_(5)` `(CH_(2))_(5)N_(5)` `(CH_(2))_(4)N_(6)` `(CH_(2))_(6)N_(4)` Answer :D

Discussion

46.	What happens when formaldehyde reacts with ammonia?
Answer» SOLUTION :UROTROPINE

Discussion

47.	Formaldehyde reacts with NaOH (50%). Which one pair of products will be obtained?
Answer» `CH_(3)COOH+CH_(3)OH` `CH_(3)OH+CH_(3)COONA` `CH_(3)COOH+C_(2)H_(5)OH` `HCOONa+CH_(3)OH` Solution :`2HCHO+NaOH to HCOONa+CH_(3)OH`

Discussion

48.	Formaldehyde reacts with ammonia to give
Answer» AMINO methane Methyl amine Hexamethylene tetramine Formaldehyde ammonia Answer :C

Discussion

49.	Formaldehyde reacts with ammonia to form .................. which is used to treat urinary infection.
Answer» SOLUTION : UROTROPINE (or) HEXAMETHYLENE tetramine

Discussion

50.	Formaldehyde polymerizes to form glucose according to the reaction 6HCHOiffC_(6)H_(12)O_(6) The theoretically computed equilibrium constant for this reaction is found to be 6xx10^(22). If 1 M solution of glucose dissociates according to the above equilibrium, the concentration of formaldehyde in the solution will be
Answer» `1.6XX10^(-2)M` `1.6xx10^(-4)M` `1.6xx10^(-6)M` `1.6xx10^(-8)M` Solution :A very high vallue of K for the given equilibrium shows that dissociation of GLUCOSE to FORM HCHO is very very small. Hence at equilibrium, we can take `[C_(6)H_(12)O_(6)]=1M` `K=([C_(6)H_(12)O_(6)])/([HCHO]^(6))i.e.,6xx10^(22)=(1)/([HCHO]^(6))` or `[HCHO]=((1)/(6xx10^(22)))^(1//6)=1.6xx10^(-4)M`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Formation of ethylene from ethyl bromide is a case of :

Formation of free radical in food material is protected by adding

Formation of ester from alkyl halide and RCOOAg is,

Formation of distributed derivaties from mono substituted benzene results the following number of isomers

Formation of diethyl ether from ethanol is based on a

Formation of diethyl ether from ethanol is based on a :

Formation of complex compound can be detected by:

Formation of coloured solution is possible when metal ion in the compound contain

Formation of complex compound can be detected by

Formation of chlorobenzene from benzene diazonium salts in presence of CuCl/HCl is called

Formation of cheese from milk is not

Formation of but-2-ene as major product by dehydration of butan-2-ol is according to ___________.

Formation of bromobenzene from benzenediazonium chloride on treatment with CuBr/HBr is called _____reaction.

Formation of amylene oxide ring in glucose is an indication that ring in glucose is at:

Formation of alkene by removal of water molecule from alcohol is called ...... of alcohol.

Formation of alkane by the action of Zn on alkyl halide is called:

Formation of alkane by the action of Zn on alkyl halide is called-

Formation of acetaldehyde from ethanol is known as

Formation of alkane by the action of zinc on alkyl halide is called :

Formation of a solution from two components can be considered as (1). pure solventtoseparated solvennt molecules, DeltaH_(1) (2). Pure solute toseparated solute molecules, DeltaH_(2) (3). Separated solvent and solute moleculestosolution, DeltaH_(3) Solution so formed will be ideal if

Formation of a solution from two components can be considered as (i) pure solvent rarr separated solvent molecules, DeltaH_(1) (ii) pure solute rarr separated solute molecules, DeltaH_(2) (iii) separated solvent and solute molecules rarr solution, DeltaH_(3). Solutionso formed will be ideal if

Formation of acetaldehyde from ethanol is called:

Formation of a solution from two componenets can be considered as : (i) pure sovent rarr separated solvent molecules, /_\H_(1) (ii) Pure solute rarrseparated molecules,/_\H_(2)(iii) separated sovent andsolute moleculesrarrsolution, /_\H_(3) solution so formed will be ideal if :

Formation of 1^@ and secondary structure of proteins involves inkages

Formation ether from ethanol based on

Formality unit is used in which scientific field ?

Formationfo alkane by actionofZinc and alkyl haide called :

The formation of cyanohydrin from a ketone is an example of

Formalin is a 40% aqueous solution of :Methanol,Ethanol,Methanal,Ethanal.

Formalin is an aqueous solution of :

Formalin is a

Formalin is 40% aqueous solutions of

Formalin is:

Formalin is

Formalin is 40% aqueous solution of

Formalin is 40% aqueous solution of :

Formaldehyde when treated with KOH gives methanol and potassium formate. The reaction is known as :

formaldehyde when treated with conc.KOH gives

Formaldehyde undergoes Cannizzaro's reaction while acetaldehyde gives aldol condensation. Explain.

Formaldehyde to ethanol

Formaldehyde reacts with NH_3 to give

Formaldehyde reacts with NH_(3) to form urotropine which has the composition

What happens when formaldehyde reacts with ammonia?

Formaldehyde reacts with NaOH (50%). Which one pair of products will be obtained?

Formaldehyde reacts with ammonia to give

Formaldehyde reacts with ammonia to form .................. which is used to treat urinary infection.