94420 + Interview Questions in Chemistry in Class 12

1.	Name the synthesis used to prepare primary amine from phthalimide.
Answer» ANSWER :GABRIEL

Discussion

2.	Name the synthetic material for preparing Nylon-66.
Answer» SOLUTION :HEXAMETHYLENE DIAMINE and ADIPIC ACID.

Discussion

3.	Name the sweetening agent used in the preparation of sweets for a diabetic patient.
Answer» SOLUTION :Sucrolose is an APPROPRIATE sweetening agent because it is stable at COOKING TEMPERATURE.

Discussion

4.	Name the sweetening agent used in the preparation of sweet for a diabetic patient .
Answer» Solution :Any artificial SWEETENING AGENT such as ASPARTAME MAY be added.

Discussion

5.	Name the sweetening agent used in the cooking of sweets for a diabetic patient.
Answer» SOLUTION :SUCRALOSE

Discussion

6.	Name the sugar present in RNA
Answer» D-ribose 2-deoxy-D-ribose D-raffinose D-Glucose SOLUTION :D-ribose

Discussion

7.	Name the sugar present in milk. How many monosaccharide units are present in it ?
Answer» Solution :Sugar present in MILK (i.e., milk sugar ) is CALLED lactose . Two monosaccharide UNITS (i.e., GLUCOSE and galactose) are present in it . Such oligosaccharides are called disaccharides.

Discussion

8.	Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called ?
Answer» SOLUTION :Lactose. Two monosaccharide UNITS are PRESENT. Such oligosaccharides are CALLED disaccharides.

Discussion

9.	Name the sugar present in milk. How many monosaccharide units are present in it ? What are such oligosaccharides called ?
Answer» Solution :The SUGAR present in the milk is LACTOSE. Lactose is a disaccharide in which D-Galactose and D- Glucose units are linked by C1-O-C4 glycosidic LINKAGE. So, on hydrolysis it will give one UNIT of D-Galactose and one MOLECULE of D-Glucose.

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10.	Name the sugar moiety present in DNA.
Answer» SOLUTION :DEOXYRIBOSE

Discussion

11.	Name the substance which when added reduces the rate of reaction.
Answer» SOLUTION :INHIBITOR

Discussion

12.	Name the substance which on heating with water at 533-543 K gives nylon 6.
Answer» SOLUTION :CAPROLACTUM

Discussion

13.	Name the substance which can act as both (i) Analgesic and antipyretic , (ii)Antiseptic and disinfectant.
Answer» SOLUTION :(i) ASPIRIN. (ii) 0.2% solution of PHENOL acts as an antiseptic whereas 1% solution acts as a disinfectant

Discussion

14.	Name the substance which are good shape-selective catalysts because of their honey-comb structure.
Answer» SOLUTION :ZEOLITES

Discussion

15.	Name the substance used as depressant in the sepressant in the saparation of two sulphide ores in Froth floatation method .
Answer» SOLUTION : SODIUM CYANIDE.

Discussion

16.	Name the sub-groups into which polymers are classified on the basis of magnitude of intermolecular forces.
Answer» Solution :The polymers are classified into the following four sub groups on the basis of magnitude of intermolecular forces present in them. 1. Elastomers : These are rubber-like solid with elastic properties. In these elastomeric polymers, the polymer chain are held together by weakest intermolecular forces. 2. Fibres : These are the thread FORMING solids which possess high tensile strength and high modulus. These characteristics can be attributed to the STRONG intermolecular forces like hydrogen bonding. 3. Thermoplastic polymers : These are linear or SLIGHTLY branched long chain molecules capable of repeatedly softening on-heating and hardening on cooling. Ex-Polyethene. 4. Thermosetting polymers : These polymers are linked or heavily branched molecules, which on heating undergo extensive cross LINKING in moulds and again become infusible. These cannot be reused. Some common examples are bakelite, urea-formaldehyde resins,. etc.

Discussion

17.	Name the state of hybridisation of orbitals in XeF_2 molecule.
Answer» SOLUTION :`SP^(3)d` HYBRIDISATION.

Discussion

18.	Name the storage polysaccharide present in animals.
Answer» SOLUTION :GLYCOGEN.

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19.	Name the starting material for preparing PVC.
Answer» SOLUTION :VINYL CHLORIDE, `CH_2 = CH-Cl`.

Discussion

20.	Name the species which concentrates at the surface.
Answer» SOLUTION :ADSORBENT

Discussion

21.	Name the species formed when an aqueous solution of amino acid is dissolved in water .
Answer» SOLUTION : ZWITTER ION

Discussion

22.	Name the slag formed in the extraction of iron/copper.
Answer» SOLUTION :EXTRACTION of iron : Calcium silicate `(CaSiO_(3))` Extraction of COPPER : Ferrous silicate `(FeSiO_(3))`

Discussion

23.	Name the site other than the active site to which the drugs bind to the enzymes.
Answer» SOLUTION :ALLOSTERIC

Discussion

24.	Name the series of salts that are formed by orthophosphoric acid with sodium hydroxide.
Answer» SOLUTION :(i) Sodium dihydrogen PHOSPHATE `(NaH_2PO_4)` (ii) Disodium hydrogen phosphate `(Na_2HPO_4)` (III) Sodium phosphate `(Na_3PO_4)`.

Discussion

25.	Name the scientist who gave the relationbetween rate of a chemical reaction and temperature.
Answer» SOLUTION :ARRHENIUS

Discussion

26.	Name the rifining process where a low melting metal can be made to flow on a sloping surface.
Answer» SOLUTION :LIQUATION.

Discussion

27.	NamethereducingagenttoobtainironfromFe_2 O _ 3athigh temperature.
Answer» Solution :Cokereduces ` Fe_2O _3` toFemetalathightemperature. `FE _2 O _3 (s)+3C (s) overset ("HIGH temperature") to2Fe(s//l) +3CO(G)`

Discussion

28.	Name the refining method used to produce semiconductors.
Answer» SOLUTION :ZONE REFINING.

Discussion

29.	Name the reducing agent uses in alumino thermite process.
Answer» SOLUTION :ALUMINIUM.

Discussion

30.	Name the reducing agent used in the extraction of zinc from zinc oxide. Write the chemical equation for this reaction.
Answer» SOLUTION :Reducing AGENT - COKE `ZnO + C RARR Zn + CO`.

Discussion

31.	Name the reagents which are used in the following conversions : (i) A primary alcohol to an aldehyde. (ii) Butan-2-one to butan-2-ol. (iii) Phenol to 2, 4, 6 - tribromophenol.
Answer» SOLUTION :(i) Reagent is pyridinium chlorochromate (PCC), a COMPLEX of chromium trioxide with PYRIDINE and HCl. `underset("PRIMARY alcohol")(R-CH_(2)OH) overset(PCC) rarr underset("Aldehyde")(R-CHO)` (ii) Reagent is `NaBH_(4)`, SODIUM borohydride. `underset("Butan-2-one")(CH_(3)CH_(2)-overset(O)overset(\|\|)C-CH_(3))overset(NaBH_(4))rarr underset("Butan-2-ol")(CH_(3)CH_(2)overset(OH)overset("\|")"CH"CH_(3))` (iii) Reagent is bromine water.

Discussion

32.	Name the reagents whch are used in the following conversions : (i) A primary alcohol to an aldehyde(ii) Butan-2-one to butan-2-ol (iii) Phenol to 2, 4, 6-tribromophenol
Answer» Solution :(i) Pyridinium chlorochromate (PC C) a complex of CHROMIUM trioxide with pyridine and HCl `CH_(3)-CH=CH-CH_(2)OH overset("PCC")rarrCH_(3)-CH=CH-CHO` (ii)`Ni//H_(2) " Or "LiAl H_(4) " Or " NaBH_(4)` (iii) AQUEOUS bromine or bromine water

Discussion

33.	Name the reagents used to convert phenol into(1) picric acid (2) 2,4,6-tribromophenol (3) Benzene (4) o-phenol sulphonic acid.
Answer» SOLUTION :(1) The reagent used to convert phenol into PICRIC ACID is concentrated NITRIC acid. (2) The reagent used to convert phenol into 2, 4, 6-tribromophenol is bromine water. (3) The reagent used to convert phenol into benzene is zinc dust. (4) The reagent used to convert phenol into o-phenol sulphonic acid is dilute sulphuric acid.

Discussion

34.	Name the reagents used in the following reactions : (i) Oxidation of a primary alcohol to carboxylic acid, (ii) Oxidation of a primary alcohol to aldehyde. (iii) Bromination of phenol to 2, 4, 6 - tribromophenol. (iv) Benzyl alcohol to benzoic acid. (v) Dehydration of propan -2- ol to propene. (vi) Butan -2- one to butan -2- ol.
Answer» Solution :(i) Acidified postassium dichromate or, neutral, acidic or alkaline postassium permanganate. (II) Pyridinium chlorochromate `("PCC"), C_(5)H_(5)overset(+)NHClCrO_(3)^(-)" in "CH_(2)Cl_(2)` or Pyridinium dichromate `("PDC"),(C_(5)H_(5)NH)_(2)Cr_(2)O_(7)^(2-)" in "CH_(2)Cl_(2)` (III) Aqueous bromine, i.e., `Br_(2)//H_(2)O`. (IV) Acidified or alkaline potassium permanganate. (v) Conc. `H_(2)SO_(4)` at 433 - 443 K or `85%` phosphoric acid at 443 K. (vi) `Ni//H_(2) or NaBH_(4) or LiAlH_(4)`.

Discussion

35.	Name the reagents used in the following reactions : (i) Oxidation of a primary alcohol to carboxylic acid. (ii) Oxidation of a primary alcohol to aldehyde. of phenol (iii) Bromination tribromophenol. to 2,4,6 (iv) Benzyl alcohol to benzoic acid. (v) Dehydration of propan-2-ol to propene. (vi) Butan-2-one to butan-2-ol.
Answer» Solution :(i) Alkaline` KMnO_(4)` (II) Pyridinium CHLOROCHROMATE in `CH_(2)Cl_(2)` (iii) `Br_(2)//H_(2)O` (iv) CONC. `H_(2)SO_(4)` (V) `LiAlH_(4)//H_(2)O` or `NaBH_(4)//H_(2)O` or `H_(2)//Pd`

Discussion

36.	Name the reagents used in the following reactions: (i) CH_(3)-CHOoverset(?)(to)CH_(3)-underset(OH)underset(\|)(CH)-CH_(3) (ii) CH_(3)-COOHoverset(?)(to)CH_(3)-COCl
Answer» SOLUTION :(i) `CH_(3)-CHOoverset(CH_(3)MgBr)(to)CH_(3)-UNDERSET(OH)underset(\|)(CH)-CH_(3)` (ii) `CH_(3)-COOHoverset(PCl_(5))(to)CH_(3)-COCl`

Discussion

37.	Name the reagent that can be used to convert (i) A primary alcohol to an aldehyde (ii) Butan-2-one to butan -2-ol.
Answer» SOLUTION :(i) Pyridine chlorochromate (PCC) (ii) `LiAlH_(4)`.

Discussion

38.	Name the reagents used in the following reactions ?
Answer» SOLUTION :`CH_(3)MgBr//H_(3)O^(+)` , (II) `PCl_(5)or PCl_(5) or SOCl_(2).`

Discussion

39.	Name the reagents I the following reactions: (i) Oxidation of a primary alcohol to a carboxylic acid (ii) Oxidation of a primary alcohol to an aldehyde. (iii) Bromination of phenol to 2,4,6-tribromophenol. (iv) Benzyl alcohol to benzoic acid (v) Dehydration of propan-2-ol to propene (vi) Butan-2-one to butan-2-ol.
Answer» <P> Solution :(i) Acidified potassium DICHROMATE or, neutral, acidic or alkaline potassium PERMANGANATE (followed by hydrolysis with dil. `H_(2)SO_(4)`) (ii) Pyridinium chlorochromate `(P C C),C_(5)H_(5)NH^(+)CrO_(3)Cl^(-)` in `CH_(2)Cl_(2)`. or Pyridinium dichromate `(PDC)," "(C_(5)H_(5)overset(+)(NH))_(2)Cr_(2)O_(7)^(2-)` in `CH_(2)Cl_(2)`. (iii) Aqueous bromine, i.e., `Br_(2)//H_(2)O`. (iv) Acidified or alkaline potassium permanganate (followed by hydrolysis with dil. `H_(2)SO_(4)`) (v) 85% `H_(2)SO_(4)` at 440K. (vi) `Ni//H_(2)` or `NaBH_(4)` or `LiAlH_(4)`.

Discussion

40.	Name the reagents used for the following conversions : i) Hexanol - 1 to hexanal ii) ethanenitrile to ethanal (ii) ethanenitrile to ethanal iii) Butene - 2to ethanal .
Answer» Solution :i) Pyridiniumchlorochromate (PCC) II) Di ISOBUTYL aluminium hydride (DIBAL - H) iii) ozone / `H_2O` - zn dust (Reductive ozonolysis)

Discussion

41.	Name the reagent which is used in the conversion of -COCl group into -CHO group.
Answer» Solution :`H_(2)` GAS is used in the conversion of `-COCL` groupusing a CATALYST PALLADIUM on barium sulphate.

Discussion

42.	Name the reagent used in the following reactions: C_(6)H_(6)-CH_(2)-CH_(3) overset(?)to C_(6)H_(5)-COO^(-)K^(+)
Answer» Solution :When an alkylbenzene is heated with `KMnO_(4)-KOH`, the entire side CHAIN is oxidised to `COO^(-)K^(+)` irrespective of the length of alkyl side chain. `UNDERSET("Ethyl BENZENE")(C_(6)H_(5)-CH_(2)-CH_(3)) underset(Delta)OVERSET(KMnO_(4)-KOH)to underset("Pot. benzoate")(C_(6)H_(5)-COO^(-)K^(+))`

Discussion

43.	Name the reagent used to convert carboxylic acids directly to the corresponding alcohols.
Answer» Solution :`LiAlH_(4)//`ether or `B_(2)H_(6)//`ether, i.e., `C_(6)H_(5) COOH overset("LiAlH_(4)" or "B_(2)H_(6)//"ether")toC_(6)H_(5)CH_(2)OH`

Discussion

44.	Name the reagent used in the conversion of ketone to hydrocarbon. Name the reaction.
Answer» SOLUTION :Zinc-Amalgam and CONC. Hydrochloric acid. The NAME of the reaction is Clemmensen REDUCTION.

Discussion

45.	Name the reagent used in reaction given below. underset("Sodium acetate")(CH_(3)-overset(O)overset(\|\|)(C)-ONa)+overset(?)tounderset("Methane")(CH_(4)+Na_(2)CO_(3))
Answer» Solution :The REAGENT USED is NaOH + CaO (sodalime). The REACTION is a DECARBOXYLATION reaction.

Discussion

46.	Name the reagent used in the conversion of benzene diazonium halide to aryl halide.
Answer» SOLUTION :`Cu_(2)X_(2)`

Discussion

47.	Name the reagent to distinguish between 2-pentanone and 3-pentanone
Answer» SOLUTION :SODIUM HYPOIODITE

Discussion

48.	Name the reagent that is used in leaching of gold
Answer» CARBON Sodium cyanide Carbon MONOXIDE IODINE SOLUTION :Sodium cyanide is used in leaching of gold.

Discussion

49.	Name the reagent that is used in leaching of gold.
Answer» Carbon Sodium cyanide Carbon monoxide lodine Solution : LEACHING involves the treatment of the ore with a suitable reagent so as to make it soluble while impurities remain INSOLUBLE. Leaching of GOLD is done with the help of their dissolution in NaCNor KCN or Cu with the help of H or Fe scrap. `4Au(s)+8CN+O_2(G)+2H_2O rarr4[Au(CN)_2]^-+4OH^-`

Discussion

50.	Name the reageants used in the following reactions: (i) CH_(3)-CO-CH_(3)overset(?)(to)CH_(3)-underset(OH)underset(\|)(CH)-CH_(3) (ii) C_(6)H_(5)-CH_(2)-CH_(3)overset(?)(to)C_(6)H_(5)CO^(-)K^(+)
Answer» Solution :(i) `CH_(3)-CO-CH_(3)overset(LiAlH_(4))(to)CH_(3)-UNDERSET(OH)underset(\|)(CH)-CH_(3)` (ii) `C_(6)H_(5)-CH_(2)-CH_(3)underset(KOH,"Heat")overset(KMnO_(4))(to)C_(6)H_(5)COO^(-)K^(+)`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Name the synthesis used to prepare primary amine from phthalimide.

Name the synthetic material for preparing Nylon-66.

Name the sweetening agent used in the preparation of sweets for a diabetic patient.

Name the sweetening agent used in the preparation of sweet for a diabetic patient .

Name the sweetening agent used in the cooking of sweets for a diabetic patient.

Name the sugar present in RNA

Name the sugar present in milk. How many monosaccharide units are present in it ?

Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called ?

Name the sugar present in milk. How many monosaccharide units are present in it ? What are such oligosaccharides called ?

Name the sugar moiety present in DNA.

Name the substance which when added reduces the rate of reaction.

Name the substance which on heating with water at 533-543 K gives nylon 6.

Name the substance which can act as both (i) Analgesic and antipyretic , (ii)Antiseptic and disinfectant.

Name the substance which are good shape-selective catalysts because of their honey-comb structure.

Name the substance used as depressant in the sepressant in the saparation of two sulphide ores in Froth floatation method .

Name the sub-groups into which polymers are classified on the basis of magnitude of intermolecular forces.

Name the state of hybridisation of orbitals in XeF_2 molecule.

Name the storage polysaccharide present in animals.

Name the starting material for preparing PVC.

Name the species which concentrates at the surface.

Name the species formed when an aqueous solution of amino acid is dissolved in water .

Name the slag formed in the extraction of iron/copper.

Name the site other than the active site to which the drugs bind to the enzymes.

Name the series of salts that are formed by orthophosphoric acid with sodium hydroxide.

Name the scientist who gave the relationbetween rate of a chemical reaction and temperature.

Name the rifining process where a low melting metal can be made to flow on a sloping surface.

NamethereducingagenttoobtainironfromFe_2 O _ 3athigh temperature.

Name the refining method used to produce semiconductors.

Name the reducing agent uses in alumino thermite process.

Name the reducing agent used in the extraction of zinc from zinc oxide. Write the chemical equation for this reaction.

Name the reagents which are used in the following conversions : (i) A primary alcohol to an aldehyde. (ii) Butan-2-one to butan-2-ol. (iii) Phenol to 2, 4, 6 - tribromophenol.

Name the reagents whch are used in the following conversions : (i) A primary alcohol to an aldehyde(ii) Butan-2-one to butan-2-ol (iii) Phenol to 2, 4, 6-tribromophenol

Name the reagents used to convert phenol into(1) picric acid (2) 2,4,6-tribromophenol (3) Benzene (4) o-phenol sulphonic acid.

Name the reagents used in the following reactions: (i) CH_(3)-CHOoverset(?)(to)CH_(3)-underset(OH)underset(|)(CH)-CH_(3) (ii) CH_(3)-COOHoverset(?)(to)CH_(3)-COCl

Name the reagent that can be used to convert (i) A primary alcohol to an aldehyde (ii) Butan-2-one to butan -2-ol.

Name the reagents used in the following reactions ?

Name the reagents used for the following conversions : i) Hexanol - 1 to hexanal ii) ethanenitrile to ethanal (ii) ethanenitrile to ethanal iii) Butene - 2to ethanal .

Name the reagent which is used in the conversion of -COCl group into -CHO group.

Name the reagent used in the following reactions: C_(6)H_(6)-CH_(2)-CH_(3) overset(?)to C_(6)H_(5)-COO^(-)K^(+)

Name the reagent used to convert carboxylic acids directly to the corresponding alcohols.

Name the reagent used in the conversion of ketone to hydrocarbon. Name the reaction.

Name the reagent used in reaction given below. underset("Sodium acetate")(CH_(3)-overset(O)overset(||)(C)-ONa)+overset(?)tounderset("Methane")(CH_(4)+Na_(2)CO_(3))

Name the reagent used in the conversion of benzene diazonium halide to aryl halide.

Name the reagent to distinguish between 2-pentanone and 3-pentanone

Name the reagent that is used in leaching of gold

Name the reagent that is used in leaching of gold.

Name the reageants used in the following reactions: (i) CH_(3)-CO-CH_(3)overset(?)(to)CH_(3)-underset(OH)underset(|)(CH)-CH_(3) (ii) C_(6)H_(5)-CH_(2)-CH_(3)overset(?)(to)C_(6)H_(5)CO^(-)K^(+)