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
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
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