JEE Main 2017 Chemistry question
A metal M reacts with nitrogen gas to afford . on heating at high temperature gives back M and on reaction with water produces a gas B. Gas B reacts with an aqueous solution of to form a deep blue compound. M and B respectively are:
Answer: (1)
Solution
Work backwards from the last clue. The **deep blue** colour with aqueous is the tetraamminecopper(II) ion,
\mathrm{ + → },
so gas **B is ammonia** — which rules out options (3) and (4). Next, the stoichiometry requires a **monovalent** metal
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