94420 + Interview Questions in Chemistry in Class 12

1.	How many of the following are silver ores (a) Chlorargirite (b) Argentitei (c) Pyrargirite (d) Azurite (e) Calamine
Answer» SOLUTION :Chlorargiite (or) Hornsilver (AgCl) Argentite `-Ag_(2)S` (Siler galance) Pyrargirite `-Ag_(2)S.Sb_(2)S_(3)` (Ruby silver) Azurite `-2CuCO_(3).Cu(OH)_(2)` Calamine `-ZnCO_(3)`

Discussion

2.	How many of the following are paramagnetic in nature. Cl_(2) O. ClO_(2), ClO_(3), Cl_(2) O_(6) , Cl(2) O_(7), ClO^(Ominus),ClO_(2)^(Ominus),ClO_(3)^(Ominus), ClO_(4)^(Ominus)
Answer» Solution :Compound CONTAINING odd number of ELECTRONS are paramagnetic. `ClO_(2) = 17 + 16 = 33` electrons , `ClO_(3 ) = 17 + 24 = 41` electrons

Discussion

3.	How many of the following are preservatives ? sodium stearate, sodium acetate, sodium benzoate, sodium sulphite, sodium metabisulphite, sodium sulphate, sodium thiosulphate.
Answer» Statement-1 is True, Statement-2 is True , Statement-2 is the correct explanation for statement 1 Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for statement 1 Statement-1 is True, Statement-2 is False Statement-1 is False, Statement-2 is True. Solution :TWO. SODIUM BENZOATE and sodium metabisulphite.

Discussion

4.	How many of the following are polar aprotic solvents?
Answer» ANSWER :6

Discussion

5.	How many of the following are oxides ores (i) Carnalite(ii) Cuprite (iii) Cassiterite(iv) Chromite (v) Cinnabar(vi) Calamine (vii) Cerussite(Viii) Chalocopyrite (ix) Chalcocite
Answer» ANSWER :3

Discussion

6.	how many of the following are ores of copper chalopyrite Cuprite , chalcoite ,malachite Azurite ,Bornite ,Limonite ,Zicite ,Braunite .
Answer» ANSWER :6

Discussion

7.	How many of the following are oxide ores. Calamine, Cuprite, Zincite, Chalcocite, Haematite, Bauxite, Magnetite, Caesiterite.
Answer» SOLUTION :Calamine `-ZnCO_(3)` (Carbonate ore) Cuprite `-Cu_(2)O` (Oxide ore) Zincite `-ZnO` (Oxide ore) Chalcocite `-Cu_(2)S` (Copper glance) (Sulphide ore) HAEMATITE `-Fe_(2)O_(3)` (Oxide ore) Bauxite `-Al_(2)O_(3),2H_(2)O` (Oxide ore)Cassiterite `-SnO_(2)` (Tin stone ) (Oxide ore) Magnetite -`Fe_(2)O_(4)` (Oxide ore)

Discussion

8.	How many of the following are optically active ?
Answer» ANSWER :2

Discussion

9.	How many of the following are not ambiguous? Pentane, Neopentane, sec-Butanol, .sec-Pentanol
Answer» Solution :Three of the GIVEN four names have only ONE possible structure. The fourth one, sec-pentanol has three possible structures and HENCE it can not be ambiguous. Three structures possible for sec-pentanol are as follows: `CH_(3)overset(OH)overset(\|)CHCH_(2)CH_(2)CH_(3), CH_(3)overset(OH)overset(\|)CHCH(CH_(3))_(2)` and `CH_(3)CH_(2)overset(OH)overset(\|)CHCH_(2)CH_(3)`

Discussion

10.	How many of the following are not a colloid? Chlorophyll, Smoke, Ruby glass and Milk
Answer» Solution :Chlorophyll. SMOKE is an EXAMPLE of solid-gas colloid SYSTEM. Ruby GLASS is an example of solid-solid colloid system. Milk is an liquid colloid system.

Discussion

11.	How many of the following are negatively charged sols ? Silver sol, Cr(OH)_(3) sol, As_(2)S_(3) sol, starch sol, silicic acid sol, haemoglobin, congo red day, prussing blue, gum, clay, charcoal.
Answer» Solution :SILVER sol, `As_(2)S_(3)` sol, STARCH sol, silicic acid sol, congo red dye, gum, clay and CHARCOAL are NEGATIVELY charged sols.

Discussion

12.	How many of the following are more basic than aniline? O -toluidine O- anisidene, m- anisidine P anisdine P -chloroaniline, m- toludine
Answer» SOLUTION :Refer ORTHO EFFECT and RESONANCE, INDUCTIVE effect etc.

Discussion

13.	How many of the following are more acidic than HCOOH?
Answer» <P> Solution :PICRIC acid, `HCl, P`- NITRO BENZOIC acid are more acidic than formic acid.

Discussion

14.	How many of the following are metal carbonates : Dolomite ,Malachite ,Azurite ,Siderite Calamine , Magnasite ,Limestone ,Washingsoda ,Cerussite
Answer» ANSWER :9

Discussion

15.	How many of the following are less basic in aqueous medium than Me-NH-Me ?
Answer» ANSWER :0

Discussion

16.	How many of the following are iso structural ? FeSO_4,7H_2O,CuSO-4.5H_2O,MnSO_4.4H_2O,ZnSO_4,7H_2O,MgSO_4, 7H_2O
Answer» SOLUTION :`FeSO_4,ZnSO_4, MgSO_4 RARR` OCTAHEDRAL COMPLEXES

Discussion

17.	How many of the following are elastomers ? Buna-N, nylon 6, Buna-S, neoprene, natural rubber, vulcanized rubber, acrilon, orlon
Answer» ANSWER :5

Discussion

18.	How many of the following are correctly match: (1) Cl_2O -(a) yellow-brown gas (bp. 10^@ C). (2) ClO_2- (b) React with O_3 gives Cl_2O_5 (dark red) it is a mixed anhydride of HClO_3 and HClO_4. (3) Cl_2O_7 - (c ) It is anhydride of HCIO_4 (only). (4) Cl_2O_7- (d) Oily explosive colourless liquid. (5) Cl_2O_7 - (e) has 2 type of O—Cl bond length.(6) I_2O_5- (f) Obtained by reaction between l_2 and CO.
Answer» (1)-(a) , (2)-(b) , (3) -(c ) , (4)-(d) (3)-(b) , (4)-(e) , (5) -(d ) , (6)-(f) (1)-(b) , (2)-(a) , (3) -(c ) , (4)-(d) (2)-( c) , (3)-(b) , (4) -(d ) , (5)-(e) Solution :`ClO_2 + O_3 OVERSET(0^@C)to Cl_2O_6` (dark red) `Cl_2O_6 + H_2O to HClO_3 + HClO_4` `2HClO_4 overset(-H_2O)to Cl_2O_7` `I_2O_5+5CO to l_2 +CO_2` (This `l_2` titrated by hopo solution)

Discussion

19.	How many of the following are correct about the stability of oxidation states of Mn i) Mn (II) gt Mn(VII)(acidic solution) (ii) Mn(II) lt Mn(IV) (alkalikne solution) (iii)Mn(VI) gt Mn(IV) (acidic solution) (iv) Mn(VI) gt Mn(VIII) (strong alkaline solution)
Answer» SOLUTION :I,II,III are CORRECT STATEMENTS

Discussion

20.	How many of the following are colloid? Sodium chloride, Starch solution, Cane sugar and Blood
Answer» Solution :Starch molecules have collidal dimensions. BLOOD is a -vely CHARGED colloidal system. REST of the compounds, i.e., NACL, urea and cane sugar FORM true solution in water.

Discussion

21.	How many of the following are coloured N_(2)O,NO,NO_2,O_2,N_(2)O_3
Answer» Solution :`N_2O,NO,O_2` - colorless gas , `NO_2` - RED brown gas , `N_(2)O_(3)` - blue COLORED LIQUID

Discussion

22.	How many of the following are cis dichlorocyclohexane.
Answer» ANSWER :5 (iii, V, vi, VII, VIII)

Discussion

23.	How many of the following are biodegradable polymers cellulose, PVC,polystyrene,glyptal,dextron,PHBV,nylon-2, nylon-6, nylon-6,6-PAN
Answer» SOLUTION :CELLULOSE, DEXTRON, PHBV and NYLON -2-nylon-6.

Discussion

24.	How many of the following are biodegradable polymers ? Cellulose , PVC , polystyrene, glyptal , dextron, PHBC , nylon -2 nylon -6 , nylon-6,6, PAN.
Answer» SOLUTION :Four. Cellulose , DEXTRON , PHBV and NYLON -2-nylon-6.

Discussion

25.	How many of the following are antihistamine drugs ? brompheniramine, terfenadine, lansoprazole, iproniazid, diphenhydramine salvarsan, diclofenac sodium, promethazine, streptomycin.
Answer» SOLUTION :FOUR. BROMPHENIRAMINE, TERFENADINE, diphenylhydramine and PROMETHAZINE

Discussion

26.	How many of the following are aerosols ? Fog forth, soap lathr, smoke, clouds, mist, foam rubber, dust, insecticide spray, hair cream
Answer» Solution :Aersolos are dispersions of SOLID in GAS or liquid in gas. SMOKE and dust are aerosols of solid in gas while FOG, mist, cloud and inserticide spray are aerosols or liquid in gas.

Discussion

27.	How many of the following amines will undergo diazotisation ? tert butyl amine, ethanamine, aniline, N-methyl-aniline, p-toluidine, m-chloro-anilines 2-phenylethanamine, o-anisidine, 2, 4, 6-tribromo aniline.
Answer» ANSWER :5

Discussion

28.	How many of the following amines will undergo diazotisation? tert-Butylamine, ethanamine, aniline, N-methylaniline,p-toluidine, m-chloroaniline, 2-phenylethanamine, o-anisidine, 2,4,6-tribromoaniline.
Answer» Solution :Five amines, i.e., ANILINE, p-toluidine, m-chloro-aniline, o-anisidine and 2,4-6-tribromoaniline, being AROMATIC PRIMARY amines UNDERGO diazotization.

Discussion

29.	How many of the following amines will undergo diazotisation tert-Butylamine, ethanamine, aniline, N-methylaniline,p-toluidine,m-chloroaniline,2-phenylethanamine,o-anisidine,2,4,6-tribromoaniline
Answer» Solution :FIVE AMINES, i.e., ANILINE, p-toluidine,m-chloroaniline,o-anisidine and 2,4,6-tribromoaniline, being AROMATIC primary amines UNDERGO diazotization.

Discussion

30.	How many of the following amines do not evolve N_(2) on treatment with NaNH_(2)//HCl. Aniline, N-methylamines, N, N-dimethyl aniline, diethyl amine, triethylamine, p-toludine, benzyl methylamine, o-anisidine, m-chloroaniline.
Answer» ANSWER :0

Discussion

31.	How many of the following alkenes on addition of HBr would give the same product in the presence or absence of peroxide? propene, 1-butene, 2-butene, 2-methylpropene, 3-methyl-1-butene, 2,3-dimethyl- 1-butene, 2-pentene, 1-pentene, 4-methyl-2-pentene.
Answer» Solution :Only 2-butene is SYMMETRICAL and HENCE GIVES the same product in presence or ABSENCE of peroxide.

Discussion

32.	How many of the following amines are more basic than aniline?
Answer» ANSWER :D

Discussion

33.	How many of the following alkenes on addition of HBr would give the sae product in the presence or absence of peroxide propene, 1-butene, 2-butene, 2-methylpropene, 3-methyl-1-butene, 2,3-dimethyl-1-butene, 2-pentene, 1-pentene, 4-methyl-2-pentene
Answer» SOLUTION :Only 2-butene is symmetrical and hence gives the sae PRODUCT in presence or absence of PEROXIDE.

Discussion

34.	How many of the following addition reactions are syn addition reaction.
Answer» SOLUTION :N//A

Discussion

35.	How many of the following act//s as bleaching agents by oxidation
Answer» WET `Cl_(2)` `CaOCl_(2)` `SO_(2)` all Solution :All THREE can ACT as bleaching agents by oxidation due to nascent oxygen.

Discussion

36.	How many of the followin amines will unergo diazotisatio? Ethanamine, tert-butylamine, aniline, N-methylaniline, m-chloroaniline, p-toluidine, 2-phenylethanamine, o-anisdine, 2,4,6-tribromoaniline.
Answer» ANSWER :5

Discussion

37.	How many of the follosing s-block elements to do not give characteristics colours in the flame test Li,Be,Ca,Sr,Mg,Na,K,Ba
Answer» SOLUTION :Be and MG

Discussion

38.	How many of the compounds listed in question 164 undergo connizzaro reaction?
Answer» Solution :Three aldehydes, i.e., methanal, BENZALDEHYDE and 2,2-dimethylbutanal do not CONTAIN `alpha`-HYDROGENS and hence UNDERGO CANNIZZARO reaction.

Discussion

39.	How many of the below listed compounds on treatment with HNO_2 would go for ring expansion?
Answer» Solution :Cyclic COMPOUNDS with `-CH_(2)-NH_(2)` group on the RING undergo ring expansion.

Discussion

40.	How many of strucurally isomericpentyl alcohols wil give immediate turbidiy in Lucas reagent ?
Answer» Solution :Only tertiary alcohols GIVE IMMEDIATE turbidity with Lucas REAGENT. ISOMERIC tertiary pentyl alcohol has the structure : `CH_(3)-underset(OH)underset(\|)overset(CH_(3))overset(\|)C-C_(2)H_(5)`

Discussion

41.	How many of following esters show acid catalysed unimolecular and alkyl-oxygen fission ester hydrolysis? C_(6)H_(5)-overset(O)overset(\|\|)C-O-CH_(3),C_(3)-overset(O)overset(\|\|)C-O-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C-CH_(3)
Answer» ANSWER :3

Discussion

42.	How many of following IUPAC names of given strutures are correct .
Answer» ANSWER :3(1,3,4)

Discussion

43.	How many of following metals impart a characteristic colour to the Bunsen flame ? (i) Na "" (ii) Li "" (iii) K "" (iv) Ba (v) Sr "" (vi) Mg "" (vii) Rb "" (viii) Cs (ix) Be "" (x )Ca "" (x i)Cu
Answer» ANSWER :9(All, EXCEPT VI and IX)

Discussion

44.	How many of following esters show A_(AL^(-1)) hydrolysis (Acid catalyzed, unimolecular and alkyl- oxygen fission ester hydrolysis) ?
Answer» ANSWER :C

Discussion

45.	How many of following compound undergo aldol condensation Methanol, 2-Methylpentanal, bnzaldehyde, benzophenone cyclohexanone, 1-phenyl propanone, phenylacetaldehyde, butan-1-01,2,2-Dimethylbutanal. .
Answer» ANSWER :D

Discussion

46.	How many of following compounds will give red colour with Barfoed reagent within 5 min. ? (a) Sucrose (b) Fructose (c )Mannose (d) maltose (e ) Lactose (f ) Glucose (g) Cellulose (h) Altrose
Answer» SOLUTION :N//A

Discussion

47.	How many of followingare correctly matchedfor electrolysticreducingin molten state.
Answer» ANSWER :5

Discussion

48.	How many of below listed compounds are soluble in aq. NaOH but insoluble in aq. NaHCO_3.
Answer» Solution :All sulphonic ACIDS, CARBOXYLIC acids and trinitrophenols are SOLUBLE in NaOH & `Na_(2)CO_(3)`

Discussion

49.	How many of following cannot show tautomerism acetophenone, acetaldehyde, cyclohexanone, acetylacetone, benzoquinone, acetone, benzaldehyde, butanone, ethyl acetoacetate
Answer» SOLUTION :BENZOQUINONE and BENZALDEHYDE.

Discussion

50.	How many octahedral voids are present in 1 mole of a compound having cubic close packed structure ?
Answer» Solution :SINCE there is only ONE octahedral void for one constituent of cubic CLOSE PACKED structure, therefore, 1 mole of the COMPOUND will have one mole or `6.022 xx 10^(23)` octahedral voids.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How many of the following are silver ores (a) Chlorargirite (b) Argentitei (c) Pyrargirite (d) Azurite (e) Calamine

How many of the following are paramagnetic in nature. Cl_(2) O. ClO_(2), ClO_(3), Cl_(2) O_(6) , Cl(2) O_(7), ClO^(Ominus),ClO_(2)^(Ominus),ClO_(3)^(Ominus), ClO_(4)^(Ominus)

How many of the following are preservatives ? sodium stearate, sodium acetate, sodium benzoate, sodium sulphite, sodium metabisulphite, sodium sulphate, sodium thiosulphate.

How many of the following are polar aprotic solvents?

How many of the following are oxides ores (i) Carnalite(ii) Cuprite (iii) Cassiterite(iv) Chromite (v) Cinnabar(vi) Calamine (vii) Cerussite(Viii) Chalocopyrite (ix) Chalcocite

how many of the following are ores of copper chalopyrite Cuprite , chalcoite ,malachite Azurite ,Bornite ,Limonite ,Zicite ,Braunite .

How many of the following are oxide ores. Calamine, Cuprite, Zincite, Chalcocite, Haematite, Bauxite, Magnetite, Caesiterite.

How many of the following are optically active ?

How many of the following are not ambiguous? Pentane, Neopentane, sec-Butanol, .sec-Pentanol

How many of the following are not a colloid? Chlorophyll, Smoke, Ruby glass and Milk

How many of the following are negatively charged sols ? Silver sol, Cr(OH)_(3) sol, As_(2)S_(3) sol, starch sol, silicic acid sol, haemoglobin, congo red day, prussing blue, gum, clay, charcoal.

How many of the following are more basic than aniline? O -toluidine O- anisidene, m- anisidine P anisdine P -chloroaniline, m- toludine

How many of the following are more acidic than HCOOH?

How many of the following are metal carbonates : Dolomite ,Malachite ,Azurite ,Siderite Calamine , Magnasite ,Limestone ,Washingsoda ,Cerussite

How many of the following are less basic in aqueous medium than Me-NH-Me ?

How many of the following are iso structural ? FeSO_4,7H_2O,CuSO-4.5H_2O,MnSO_4.4H_2O,ZnSO_4,7H_2O,MgSO_4, 7H_2O

How many of the following are elastomers ? Buna-N, nylon 6, Buna-S, neoprene, natural rubber, vulcanized rubber, acrilon, orlon

How many of the following are correct about the stability of oxidation states of Mn i) Mn (II) gt Mn(VII)(acidic solution) (ii) Mn(II) lt Mn(IV) (alkalikne solution) (iii)Mn(VI) gt Mn(IV) (acidic solution) (iv) Mn(VI) gt Mn(VIII) (strong alkaline solution)

How many of the following are colloid? Sodium chloride, Starch solution, Cane sugar and Blood

How many of the following are coloured N_(2)O,NO,NO_2,O_2,N_(2)O_3

How many of the following are cis dichlorocyclohexane.

How many of the following are biodegradable polymers cellulose, PVC,polystyrene,glyptal,dextron,PHBV,nylon-2, nylon-6, nylon-6,6-PAN

How many of the following are biodegradable polymers ? Cellulose , PVC , polystyrene, glyptal , dextron, PHBC , nylon -2 nylon -6 , nylon-6,6, PAN.

How many of the following are antihistamine drugs ? brompheniramine, terfenadine, lansoprazole, iproniazid, diphenhydramine salvarsan, diclofenac sodium, promethazine, streptomycin.

How many of the following are aerosols ? Fog forth, soap lathr, smoke, clouds, mist, foam rubber, dust, insecticide spray, hair cream

How many of the following amines will undergo diazotisation ? tert butyl amine, ethanamine, aniline, N-methyl-aniline, p-toluidine, m-chloro-anilines 2-phenylethanamine, o-anisidine, 2, 4, 6-tribromo aniline.

How many of the following amines will undergo diazotisation? tert-Butylamine, ethanamine, aniline, N-methylaniline,p-toluidine, m-chloroaniline, 2-phenylethanamine, o-anisidine, 2,4,6-tribromoaniline.

How many of the following amines will undergo diazotisation tert-Butylamine, ethanamine, aniline, N-methylaniline,p-toluidine,m-chloroaniline,2-phenylethanamine,o-anisidine,2,4,6-tribromoaniline

How many of the following amines do not evolve N_(2) on treatment with NaNH_(2)//HCl. Aniline, N-methylamines, N, N-dimethyl aniline, diethyl amine, triethylamine, p-toludine, benzyl methylamine, o-anisidine, m-chloroaniline.

How many of the following alkenes on addition of HBr would give the same product in the presence or absence of peroxide? propene, 1-butene, 2-butene, 2-methylpropene, 3-methyl-1-butene, 2,3-dimethyl- 1-butene, 2-pentene, 1-pentene, 4-methyl-2-pentene.

How many of the following amines are more basic than aniline?

How many of the following alkenes on addition of HBr would give the sae product in the presence or absence of peroxide propene, 1-butene, 2-butene, 2-methylpropene, 3-methyl-1-butene, 2,3-dimethyl-1-butene, 2-pentene, 1-pentene, 4-methyl-2-pentene

How many of the following addition reactions are syn addition reaction.

How many of the following act//s as bleaching agents by oxidation

How many of the followin amines will unergo diazotisatio? Ethanamine, tert-butylamine, aniline, N-methylaniline, m-chloroaniline, p-toluidine, 2-phenylethanamine, o-anisdine, 2,4,6-tribromoaniline.

How many of the follosing s-block elements to do not give characteristics colours in the flame test Li,Be,Ca,Sr,Mg,Na,K,Ba

How many of the compounds listed in question 164 undergo connizzaro reaction?

How many of the below listed compounds on treatment with HNO_2 would go for ring expansion?

How many of strucurally isomericpentyl alcohols wil give immediate turbidiy in Lucas reagent ?

How many of following esters show acid catalysed unimolecular and alkyl-oxygen fission ester hydrolysis? C_(6)H_(5)-overset(O)overset(||)C-O-CH_(3),C_(3)-overset(O)overset(||)C-O-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)

How many of following IUPAC names of given strutures are correct .

How many of following metals impart a characteristic colour to the Bunsen flame ? (i) Na "" (ii) Li "" (iii) K "" (iv) Ba (v) Sr "" (vi) Mg "" (vii) Rb "" (viii) Cs (ix) Be "" (x )Ca "" (x i)Cu

How many of following esters show A_(AL^(-1)) hydrolysis (Acid catalyzed, unimolecular and alkyl- oxygen fission ester hydrolysis) ?

How many of following compound undergo aldol condensation Methanol, 2-Methylpentanal, bnzaldehyde, benzophenone cyclohexanone, 1-phenyl propanone, phenylacetaldehyde, butan-1-01,2,2-Dimethylbutanal. .

How many of following compounds will give red colour with Barfoed reagent within 5 min. ? (a) Sucrose (b) Fructose (c )Mannose (d) maltose (e ) Lactose (f ) Glucose (g) Cellulose (h) Altrose

How many of followingare correctly matchedfor electrolysticreducingin molten state.

How many of below listed compounds are soluble in aq. NaOH but insoluble in aq. NaHCO_3.

How many of following cannot show tautomerism acetophenone, acetaldehyde, cyclohexanone, acetylacetone, benzoquinone, acetone, benzaldehyde, butanone, ethyl acetoacetate

How many octahedral voids are present in 1 mole of a compound having cubic close packed structure ?