NCERT Class 12 Chemistry Previous Years Questions and Answers

NCERT Class 12 Chemistry Previous Years Questions and Answers NCERT Class 12 Chemistry QUESTIONS

NCERT Class 12 Chemistry Previous Years Questions and Answers

131 If the initial concentration of reactant is doubled, t1/2 is also doubled, the order of reaction is
A zero
B 3
C 2
D None of these

Answer: zero
132 The rate of first order reaction is 0.04 mol L-1 s-1 at 10 sec. and 0.03 mol L-1 at 2C seconds after initiation of the reaction. t1/2 of reaction is
A 24.1 s
B 34.1 s
C 44.1 s
D 54.1 s

Answer: 24.1 s
133 Which has the lowest boiling point at 1 atm pressure?
A 0.1 M Urea
B 0.1 M A1Cl3
C 0.1 M KCl
D 0.1 M CaCl2

Answer: 0.1 M Urea
134 Heroin is
A Narcotic
B Antiseptic
C Non-narcotic
D Anaesthetic

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

Answer: Tranquilizer
136 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
137 Which of the following is not an antacid?
A Phenelzine
B Cimetidine
C Ranitidine
D Al(OH)3

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

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

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

Answer: Equanil

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