NCERT Class 12 Chemistry Questions and Answers

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

NCERT Class 12 Chemistry Questions and Answers

141 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
142 A polymer of butadiene and acrylonitrile is called
A Buna-2
B Buna-A
C Buna-S
D Buna-N

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

Answer: Cellulose
144 Which of the following aqueous solutions should have the highest boiling point?
A 1.0 M NaOH
B 1.0 M Na2SO4
C 1.0 M NH4NO3
D 1.0 M KNO3

Answer: 1.0 M Na2SO4
145 In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M MgCl2 solution is _________ .
A about twice
B the same
C about three times
D about six times

Answer: about three times
146 Which of the following statements is false?
A Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point.
B The osmotic pressure of a solution is given by the equation π = CRT (where C is the molarity of the solution).
C Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is BaCl2 > KCl > CH3COOH > sucrose.
D According to Raoult’s law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution.

Answer: Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point.
147 Which of the following aqueous solutions should have the highest boiling point?
A 1.0 M NaOH
B 1.0 M Na2SO4
C 1.0 M NH4NO3
D 1.0 M KNO3

Answer: 1.0 M Na2SO4
148 Low concentration of oxygen in the blood and tissues of people living at high altitude is due to _________ .
A low temperature
B low atmospheric pressure
C high atmospheric pressure
D both low temperature and high atmospheric pressure

Answer: low atmospheric pressure
149 The number of moles of NaCl in 3 litres of 3M solution is
A 1
B 3
C 9
D 27

Answer: 9
150The molality of pure water is
A 55.5
B 50.5
C 18
D 60.5

Answer: 55.5

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