NCERT Class 12 Chemistry General Knowledge Questions and Answers

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

NCERT Class 12 Chemistry General Knowledge Questions and Answers

111 In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
A Assertion and reason both are correct statements and reason is correct explanation for assertion.
B Assertion and reason both are incorrect statements.
C Assertion and reason both are correct statements but reason is not correct explanation for assertion.
D Assertion is correct statement but reason is wrong statement.

Answer: Assertion and reason both are incorrect statements.
112 Relative lowering of vapour pressure is a colligative property because ________ .
A It depends on the concentration of a non electrolyte solute in solution and does not depend on the nature of the solute molecules.
B It depends on the concentration of an electrolyte or nonelectrolyte solute in solution as well as on the nature of solute molecules.
C It depends on the concentration of a non electrolyte solute in solution as well as on the nature of the solute molecules.
D It depends on number of particles of electrolyte solute in solution and does not depend on the nature of the solute particles.

Answer: It depends on the concentration of a non electrolyte solute in solution and does not depend on the nature of the solute molecules.
113 Benzoic acid, when dissolved in benzene, which of the following is correct.
A The benzoic acid will undergo dissociation.
B The benzoic acid will undergo association.
C Observed molar mass of benzoic acid in benzene will less than normal molar mass.
D Observed molar mass of benzoic acid in benzene is more than normal molar mass.

Answer: The benzoic acid will undergo association.
114 Which of the following is non-reducing sugar?
A Sucrose
B Lactose
C Glucose
D Maltose

Answer: Sucrose
115 Which of the following statements is not correct?
A Denaturation makes the proteins more active.
B Insulin maintains sugar level in the blood of a human body.
C Blood proteins thrombin and fibrinogen are involved in blood clotting.
D Ovalbumin is a simple food reserve in egg white.

Answer: Denaturation makes the proteins more active.
116 Extent of adsorption of adsorbate from solution phase increases with ___________ .
A increase in amount of adsorbate in solution.
B decrease in amount of adsorbate in solution.
C decrease in surface area of adsorbent.
D increase in temperature of solution.

Answer: increase in amount of adsorbate in solution.
117 Glucose does not react with
A (CH3CO)2O
B NaHSO3
C NH2OH
D Cone. HNO3

Answer: NaHSO3
118 The stability of lyophobic sols is due to
A the charge on particles
B Tyndall effect.
C adsorption of covalent molecules on the colloid
D the size of the particles

Answer: the charge on particles
119 Gold sol can be prepared by
A Reduction of AUCl3 with HCHO solution.
B Peptization
C Hydrolysis of AUCl3
D Oxidation of Gold by aqua-regia

Answer: Reduction of AUCl3 with HCHO solution.
120 Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are
A m, x
B M, x
C M, m
D F, x

Answer: m, x

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