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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 formula of C from the following?

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a

${Cu(OH)}_{2}$

b

${CuSO}_{4}$

c

${CuCO}_{3} {.Cu(OH)}_{2}$

d

${{[Cu(NH}_{3})_{4}]}^{2+}$

answer is A.

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Detailed Solution

detailed_solution_thumbnail

${NH}_{2} {CONH}_{2} + H_{2} O \to N H_{2} C O O^{-} N H_{4}^{+} (A)$

$N H_{2} C O O^{-} N H_{4}^{+} \overset{∆}{\to 2 N H_{3} (B) + C O_{2}}$

When $N H_{3}$ is passed through $C u^{+ 2}$ solution it forms a deep blue colour complex.

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