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?

Correct answer: A. [Cu ( NH _ 3 ) _ 4 ] ^ 2 + NH _ 2 CONH _ 2 + H _ 2 O → CO _ 2 + NH _ 4 OH _ (A) NH _ 4 OH Δ → NH _ 3 _ (B) + H _ 2 O Cu ^ + 2 (aq) + 4 NH _ 3 → [Cu ( NH _ 3 ) _ 4 ] _ (C) + 2 (deep blue)

NEET 2020

Exam: NEET
Year: 2020
Subject: Chemistry
Chapter: Coordination Compounds

NEET 2020 · Chemistry · Coordination Compounds

Urea reacts with water to form A which will decompose to form B . B...

Urea reacts with water to form

A

which will decompose to form

B

B

when passed through

{Cu}^{2 +}\left(aq\right)

, deep blue colour solution

C

is formed. What is the formula of

C

from the following?

Options

A ${\left[Cu{\left({NH}_{3}\right)}_{4}\right]}^{2 +}$
BCu{ $\left(OH\right)}_{2}$
C{CuCO}_{3} \cdot Cu{ $\left(OH\right)}_{2}$
D ${CuSO}_{4}$

Correct answer

A. ${\left[Cu{\left({NH}_{3}\right)}_{4}\right]}^{2 +}$

Step-by-step solution

${NH}_{2}{CONH}_{2} + {H}_{2}O \to {CO}_{2} + \mathop{{NH}_{4}OH}_{\left(A\right)}$

${NH}_{4}OH\overset{\Delta}{\to}\mathop{{NH}_{3}}_{\left(B\right)} + {H}_{2}O$

${Cu}^{+ 2}\left(aq\right) + 4{NH}_{3} \to \mathop{\left[Cu{\left({NH}_{3}\right)}_{4}\right]}_{\left(C\right)}+ 2$ (deep blue)

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