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  4. A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are :

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Q. A metal (A) on heating in nitrogen gas gives compound $B. B$ on treatment with $H_2O$ gives a colourless gas which when passed through $CuSO_4$ solution gives a dark blue-violet coloured solution. $A$ and $B$ respectively, are :

JEE MainJEE Main 2020The s-Block Elements

Solution:

$CuSO_4 + 4NH_3 \rightarrow \underset{\text{deep blue solution}}{[Cu(NH_3)_4]SO_4}$

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