Question

Maximum covalency of nitrogen is
(a) two
(b) four
(c) three
(d) five

Answer 1

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(B) . FOUR☆☆☆☆

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Answer 2

Copper will not react with hydrochloric acid that type of reaction to occur that reduction potential of reactant.

Moreover, the electrons must be lower than with type of reaction to occur that reduction and deserves the liberated from cold hydrochloric acid by the action of a reduction potential of the reactant receiving the electrons.