1. CuSO ₄ 2. [Cu(NH ₃ ) ₄ ] ²⁺ 3. Cu(OH) ₂ 4. CuCO ₃· Cu(OH) ₂

Answer: 2. [Cu(NH ₃ ) ₄ ] ²⁺ Urea + water: NH₂CONH₂+2H₂O→(NH₄)₂CO₃ (A). On decomposition: (NH₄)₂CO₃→ 2NH₃+CO₂+H₂O ; B is NH₃ . NH₃ with mathrmCu²⁺ gives the deep blue complex mathrm[Cu(NH₃)₄]²⁺ (C). Answer: option (2).

Topic: Werner's theory, ligands, coordination number, denticity, chelation· Coordination Compounds

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. CuSO\(_4\)

2. [Cu(NH\(_3\))\(_4\)]\(^{2+}\)

3. Cu(OH)\(_2\)

4. CuCO\(_3\cdot\)Cu(OH)\(_2\)

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Answer: 2. [Cu(NH\(_3\))\(_4\)]\(^{2+}\)

Urea + water: \(\mathrm{NH_2CONH_2+2H_2O\rightarrow(NH_4)_2CO_3}\) (A).
On decomposition: \(\mathrm{(NH_4)_2CO_3\rightarrow 2NH_3+CO_2+H_2O}\); B is \(\mathrm{NH_3}\).
\(\mathrm{NH_3}\) with \(\mathrm{Cu^{2+}}\) gives the deep blue complex \(\mathrm{[Cu(NH_3)_4]^{2+}}\) (C).

Answer: option (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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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 ?

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