Q.):-  Complete the missing components / variables given as x and y in the following reactions.
$$\begin{gathered} a) Pb{\left(N{O}_3\right)}_2(aq)+2Kl(aq)\to Pb{I}_2\left(x\right)+2KN{O}_3(y\left) \\ b\right) Cu\left(s\right)+2AgN{O}_3\left(aq\right)\to Cu\left(N{O}_3{)}_2\right(aq)+x(s\left) \\ c\right) Zn\left(s\right)+H_{2}S{O}_4\left(aq\right)\to ZnS{O}_4\left(x\right)+H_2\left(y\right) \\ d) CaC{O}_3(s\left)\stackrel{x}{\to }CaO\right(s)+C{O}_2(g) \end{gathered}$$

Dear Student,

Please find below the solution of your asked query:

(a) 'x' is (s) & 'y' is (aq) as this is a precipitation type of reaction in which we get a solid product and the other one is aqueous in nature.

(b) 'x' is Ag as this is a displacement type of reaction in which Silver is displaced.

(c) 'x' is (aq) & 'y' is (g) as it is a metal + acid $\to$ salt + hydrogen gas type of reaction.

(d) 'x' is Heat or $\mathbf{∆}$ as this this is a Thermal decomposition type of reaction.

Hope this information clears your doubts about the concerned topics.

Keep asking!!

Regards