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 ?
A) $[Cu(NH_3)_4]^{2+}$
B) $Cu(OH)_2$
C) $CuCO_3 \cdot Cu(OH)_2$
D) $CuSO_4$
Explanation
[Solution] Urea + water gives ammonium carbamate (A), which decomposes to $NH_3$ (B); $NH_3$ with $Cu^{2+}$ forms deep blue $[Cu(NH_3)_4]^{2+}$. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.