How many of the following reactions are homogeneous reversible reactions?

( $1$ ) ${CH}_{3} {COOH}_{(l)} + C_{2} H_{5} {OH}_{(l)} ⇌ {CH}_{3} {COOC}_{2} {H_{5}}_{(l)} + H_{2} O_{(l)}$

( $2$ ) $C_{(s)} + {CO}_{2}_{(g)} ⇌ 2 {CO}_{(g)} + H_{2} O_{(g)}$

( $3$ ) ${H_{2}}_{(g)} + {CO}_{2}_{(g)} ⇌ {CO}_{(g)} + H_{2} O_{(g)}$

( $4$ ) ${CO}_{(g)} + {Cl}_{2}_{(g)} ⇌ {COCl}_{2}_{(g)}$

( $5$ ) ${NH}_{4} {HS}_{(s)} ⇌ {NH}_{3}_{(g)} + H_{2} S_{(g)}$

( $6$ ) ${CaCO}_{3}_{(s)} ⇌ {CaO}_{(s)} + {CO}_{2}_{(g)}$

( $7$ ) ${N_{2}}_{(g)} + {O_{2}}_{(g)} ⇌ 2 {NO}_{(g)}$

( $8$ ) ${CO}_{2}_{(g)} + C_{(s)} ⇌ 2 {CO}_{(g)}$

( $9$ ) ${SO}_{2}_{(g)} + {NO}_{2}_{(g)} ⇌ {SO}_{3}_{(g)} + {NO}_{(g)}$

( $10$ ) ${NO}_{(g)} + \frac{1}{2} {Br}_{2}_{(l)} ⇌ 2 {NOBr}_{(g)}$

Question

Important Questions on Equilibrium