NCERT Class 12 Chemistry Short Questions & Answers
1 Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is
Answer: 0.20
5 A first order reaction has specific reaction rate 10-2s-1. How much time it will take for 20g of reactant to reduce to 5g?
Answer: 138.6 s
7 The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is
Answer: 0.5 × 10-3 s-1
8 The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months?
Answer: 0.72 M
9 Among the ligands NH3, en, CN and CO, the correct order of field strength is
Answer: NH3 < en < CN– < CO
10 Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is
Answer: complex forming nature.
Question and Answers
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