NCERT Class 12 Chemistry General Awareness Questions with Answers
61 Which of the following statements about the catalyst is true?
Answer: A catalyst accelerates the rate of reaction by bringing down the activation energy.
62 Which among the following is a false statement?
Answer: Molecularity of a reaction may be zero or fraction.
63 A solution containing 10 g per dm3 of urea (molar mass 60 g mol-1) is isotonic with 5% solution of non-volatile solute, MB of solute is
Answer: 300 g mol-1
65 Which of the following reactions is an example of auto reduction?
Answer: Cu20 + 1/2 Cu2S → 3Cu + 1/2 SO2
66 The electrolytic reduction technique is used in the extraction of
Answer: Highly electropostive elements.
67 If molality of dilute solution is doubled, the value of molal depression constant (Kf) will be
68 Which one of the following metals is required as cofactor by all enzymes utilizing ATP in phosphate transfer?
69 An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because _________ .
Answer: it loses water due to reverse osmosis.
70 What will be the fraction of molecules having energy equal to or greater than activation energy, Ea?