JEE Main 2017 · 8 Apr · Shift 1 · Chemistry Q48

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ChemistrySingle correct+4 / -1Question 48 of 90

A metal 'M' reacts with nitrogen gas to afford ' $\ce{M3N}$ '. ' $\ce{M3N}$ ' on heating at high temperature gives back 'M' and on reaction with water produces a gas 'B'. Gas 'B' reacts with aqueous solution of $\ce{CuSO4}$ to form a deep blue compound. 'M' and 'B' respectively are :

Li and

\ce{NH3}

Ba and

\ce{N2}

Na and

\ce{NH3}

Al and

\ce{N2}

Answer and worked solution

Official answer: A

Lithium burns in nitrogen to give $\ce{Li3N}$ , which with water gives $\ce{NH3}$ (B). Ammonia gives the deep blue $\ce{[Cu(NH3)4]^2+}$ with copper sulphate.

Topics:Alkali metals Cation analysis

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JEE Main 2017 · 8 Apr · Shift 1, Chemistry question 48