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Free download in PDF CBSE Class 12 Chemistry MCQs & Answers. Here Gkseries provide Chemistry Solve Questions and Answers for CBSE Class 12 Students.
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
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
85
Bessemer converter is used in the manufacture of
[A]
Steel
[B]
Cast iron
[C]
Pig iron
[D]
Wrought iron
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
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
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
91
Heroin is
[A]
Narcotic
[B]
Antiseptic
[C]
Non-narcotic
[D]
Anaesthetic
92
Drug which is used to reduce anxiety and brings calmness is known as
[A]
Antacids
[B]
Tranquilizer
[C]
Diuretic
[D]
Analgesic
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
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
97
Which of the following is used as tranquilizer?
[A]
Chlorpheniramine
[B]
Equanil
[C]
Naproxene
[D]
Tetracycline
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
100
Which of the following is a biodegrable polymer?
[A]
Nylon-6
[B]
Cellulose
[C]
Polyethene
[D]
PVC
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