NCERT Class 12 Chemistry Competitive Exams Questions and Answers

NCERT Class 12 Chemistry Competitive Exams Questions and Answers NCERT Class 12 Chemistry QUESTIONS

NCERT Class 12 Chemistry Competitive Exams Questions and Answers

81 In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M MgCl2 solution is _________ .
A the same
B about twice
C about three times
D about six times

Answer: about three times
82 Which of the following polymer is stored in the liver of animals?
A Glycogen
B Amylopectin
C Amylose
D Cellulose

Answer: slope of velocity-time graph
83 At 100°C, the vapour pressure of a solution of 6.5 g of solute in 100 g of water is 732 mm. If Kb is 0.52 K/m, the boiling point of solution will be [HOTS]
A 102°C
B 103°C
C 101 °C
D 100°C

Answer: 101 °C
84 The polymer which is used in manufacture of squeeze bottles is
A Polypropene
B Low density polythene
C Polystyrene
D Teflon

Answer: Low density polythene
85 Which of the following is not correct regarding terylene?
A Thermosetting plastic
B also called dacron
C Step growth polymer
D Synthetic fibre

Answer: Thermosetting plastic
86 Caprolactum is used for preparation of
A Nylon-2 – Nylon-6
B Nylon-6,6
C Nylon-6
D Nylon 6, 10

Answer: Nylon-6
87 Which of the following is thermosetting polymer
A Bakelite
B Nylon-6,6
C Neoprene
D PVC

Answer: Bakelite
88 People add sodium chloride to water while boiling eggs. This is to
A increase the boiling point.
B prevent the breaking of eggs.
C decrease the boiling point.
D make eggs tasty.

Answer: increase the boiling point.
89 Which of the following has ester linkages?
A Terylene
B PVC
C Bakelite
D Nylon

Answer: Terylene
90 The polymer used in orthopaedic devices and in controlled drug release is
A PHBV
B Orion
C PTFE
D SBR

Answer: Orion

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