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Solved Examples on Hydrogen

Question:1, The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid from which hydrogen is released on treatment with water. The metal is

                  (A) Al                                                  (B) Ca

                  (C) Cu                                                 (D) Zn

Answer: B

Solution: Calcium is obtained by electrolysis of CaCl2. Ca reacts with hydrogen to form calcium hydride (CaH2) which is a colourless solid.

Calcium hydride reacts with water to form calcium hydroxide and dihydrogen gas..

CaCl2 + H2 + 2 Na → CaH2 + 2 NaCl

Hence, the correct option is B.

Question:2, Hydrogen peroxide acts both as an oxidising and as a reducing agent in alkaline solution towards certain first now transitional metal ions. Illustrate both these properties of H2O2 using chemical equations.

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Solution:              

As oxidising agent

Question:3, Why hydrated barium peroxide is...

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