NCERT Class 12 Chemistry Question bank and Answers
NCERT Class 12 Chemistry
QUESTIONS
NCERT Class 12 Chemistry Question bank and Answers
101 Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be
A 0.33
B 0.666
C 0.3 × 10-2
D None
102 The best coagulant for the precipitation of Fe(OH)3 sol is
A Na3PO4
B Na2SO4
C NaNO3
D Na2HPO3
103 Which of the following statements is not true?
A Natural rubber is frans-polyisoprene
B Vulcanisation makes rubber hard due to cross linkages with sulphur.
C Buna-S is addition copolymer of butadiene and styrene
D Natural rubber is cis 1, 4-polymer of isoprene
Answer: Natural rubber is frans-polyisoprene
104 The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows
A no deviation from Raoult’s Law.
B positive deviation from Raoult’s Law.
C negative deviation from Raoult’s Law.
D that the solution is unsaturated.
Answer: positive deviation from Raoult’s Law.
105 Identify the positively charged colloid.
A Haemoglobin
B Gold sol
C As2S3
D Clay
106 The vitamin present in oils and fats are
A A and C
B A and D
C B and C
D A and B
107 RNA and DNA are chiral molecules, their chirality is due to
A chiral bases
B chiral phosphate units
C D-sugar component
D L-sugar component
Answer: D-sugar component
108 The term ‘sorption’ stands for ___________ .
A adsorption
B absorption
C both absorption and adsorption
D desorption
Answer: both absorption and adsorption
109 A basic amino acid among the following is
A histidine
B leucine
C glycine
D valine
110 Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is
A 0.40
B 0.46
C 0.36
D 0.20