Kelvi

Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+^{2+} (aq), deep blue colour solution C is formed. What is the formula of C from the following?

medium
RedoxReactions
2020
chemistry
1. 

[Cu(NH3)4]2+[Cu(NH_3)_4]^{2+}

2. 

Cu(OH)2Cu(OH)_2

3. 

CuCO3⋅Cu(OH)2CuCO_3 \cdot Cu(OH)_2

4. 

CuSO4CuSO_4

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