Question

Urea reacts with water to form $A$, which will decompose to form $B$. When $B$ is passed into a white precipitate of $C$ which is formed when $A{g}^{+}\left(aq\right)$ and $C{l}^{-}\left(aq\right)$ are mixed then a colourless solution of $D$ is formed. What is the formula of $D$?

• A. $AgN{O}_3$
• B. $\left[Ag\right(N{H}_3{)}_2{]}^{+}$
• C. $\left[Ag\right(N{H}_3{)}_2{]}^{2+}$
• D. $AgCl$

Answer 1

The correct option is B $\left[Ag\right(N{H}_3{)}_2{]}^{+}$

$N{H}_{2}CON{H}_2+2H_{2}O\to \underset{A}{(N{H}_4{)}_{2}C{O}_3}\underset{A}{(N{H}_4{)}_{2}C{O}_3}\rightleftharpoons \underset{B}{2N{H}_3}+H_{2}O+C{O}_2$
$A{g}^{+}+C{l}^{-}\rightleftharpoons \underset{C}{AgCl\left(s\right)}$
$\underset{C}{AgCl\left(s\right)}+\underset{B}{2N{H}_3}\to \underset{D}{\left[Ag\right(N{H}_3{)}_2]Cl}$