Question 56
A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify M and black coloured product and also explain the reaction of M with oxygen

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Solution

Copper does not liberate hydrogen from acids as hydrogen is more reactive than copper. It reacts with oxygen or air to form black coloured cupric oxide. Hence, 'M' is Cu and the black product is CuO. The reaction involved is:

$2 Cu(s) + O_{2} (g) \to 2 CuO(s)$

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Question 64
An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.