CBSE Class 12 Chemistry Quiz | CBSE Class 12 Chemistry MCQs & Answers

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Questions
81 In the commercial electrochemical process for aluminium extraction, electrolyte used is
A A molten mixture of Al2O3 and Na3AlF6.
B A molten mixture of Al2O3 and Al(OH)3.
C Al(OH)3 is NaOH solution.
D An aqueous solution of Al2 (SO4)3.

Answer: A molten mixture of Al2O3 and Na3AlF6.
82 Which ore can be best concentrated by froth floatation process?
A Galena
B Magnetite
C Malachite
D Cassiterite

Answer: Galena
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83 Electrolytic reduction of Al2O3 to Al by Hall- Herault process is carried out
A in presence of cryolite which forms a melt with high melting point.
B in presence of cryolite which forms a melt with lower melting point.
C in presence of NaCl.
D in presence of fluorite.

Answer: in presence of cryolite which forms a melt with lower melting point.
84 The chemical composition of ‘slag’ formed during the melting process in the extraction of copper is
A Cu2O + FeS
B FeSiO3
C CuFeS2
D Cu2S + FeO

Answer: FeSiO3
85 Bessemer converter is used in the manufacture of
A Steel
B Cast iron
C Pig iron
D Wrought iron

Answer: Steel
86 The method of zone refining of metals is based on the principle of
A greater solubility of the impurity in the molten state than in the solid.
B greater noble character of the solid metal than that of impurity.
C greater mobility of the pure metal than that of the impurity.
D higher melting point of the impurity than that of the pure metal.

Answer: greater solubility of the impurity in the molten state than in the solid.
87 Purest form of iron is
A Wrought iron
B Stainless steel
C Hard Steel
D Cast iron

Answer: Wrought iron
88 A drug that is antiseptic as well as analgesic is
A Para acetamidophenol
B Paracetamol
C Chloropromazine hydrochloride
D Chloramphenicol

Answer: Para acetamidophenol
89 Which one is a broad spectrum drug?
A Chloramphenicol
B Plasmoquine
C Chloroquine
D Chloroxylenol

Answer: Chloramphenicol
90 Detergents are better than soaps because
A They can be used in acidic solution
B They are less affected by hard water
C Both (a) and (b)
D They wash clothes better

Answer: Both (a) and (b)
91 Heroin is
A Narcotic
B Antiseptic
C Non-narcotic
D Anaesthetic

Answer: Narcotic
92 Drug which is used to reduce anxiety and brings calmness is known as
A Antacids
B Tranquilizer
C Diuretic
D Analgesic

Answer: Tranquilizer
93 Aspiring is an acetylation product of ______
A p-Dihydroxybenzene
B o-Hydroxybenzoic acid
C o-Dihydroxy benzene
D m-Hydroxy benzoic acid

Answer: o-Hydroxybenzoic acid
94 Which of the following is not an antacid?
A Phenelzine
B Cimetidine
C Ranitidine
D Al(OH)3

Answer: Phenelzine
95 Sodium benzoate is used as
A food preservative
B detergent
C artificial sweetener
D antioxidant

Answer: food preservative
96 Mixture of chloroxylenol and terpineol acts as
A antiseptic
B analgesics
C antipyretic
D antibiotic

Answer: antiseptic
97 Which of the following is used as tranquilizer?
A Chlorpheniramine
B Equanil
C Naproxene
D Tetracycline

Answer: Equanil
98 The manufacture of nylon-6 involves condensation of
A Phenol and formaldehyde
B Urea and formaldehyde
C Adipic acid and hexamethylene diamine
D Ethylene glycol and pthalic acid

Answer: Adipic acid and hexamethylene diamine
99 A polymer of butadiene and acrylonitrile is called
A Buna-2
B Buna-A
C Buna-S
D Buna-N

Answer: Buna-2
100 Which of the following is a biodegrable polymer?
A Nylon-6
B Cellulose
C Polyethene
D PVC

Answer: Cellulose

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