Urea reacts with water to form A which will decompose to form B. B when passed through $Cu^{2+}(aq)$, deep blu

Question

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?

Accepted Answer

$NH_2CONH_2 + H_2O \rightarrow (NH_4)_2CO_3 (A) \xrightarrow{\Delta} NH_3(g) + CO_2(g) + H_2O(l) (B)$. Then, $NH_3(g) + Cu^{2+}(aq) \rightarrow [Cu(NH_3)_4]^{2+} (C)$ (Blue coloured solution).

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