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 ?

1. A. [ Cu(NH3)4 ] 2+
2. B. Cu(OH)2
3. C. CuCO3.Cu(OH)2
4. D. CuSO4

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