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  4. Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+(aq), deep blue colour solution C is formed. What is the formula of C from the following

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Q. Urea reacts with water to form $A$ which will decompose to form $B$. $B$ when passed through $Cu^{2+}(aq)$, deep blue colour solution C is formed. What is the formula of C from the following

NEETNEET 2020The p-Block Elements - Part2

Solution:

$NH_{2}CONH_{2}+H_{2}O \to$
$\underset{(A)}{(NH_{4})_{2}CO_{3}} \rightleftharpoons \underset{(B)}{2NH_{3}}+H_{2}O+CO_{2}$
$\underset{(B)}{4NH_{3}}+\overset{2+}{Cu(aq)} \to \underset{\text{(deep blue (C)}}{\left[Cu\left(NH_{3}\right)_{4}\right]_{\left(aq\right)}^{2+}}$