For the system, at equilibrium $N{H}_{4}H{S}_{\left(s\right)}\rightleftharpoons N{H}_{3\left(g\right)}+H_2{S}_{\left(g\right)}$. How many of the following statements are CORRECT

$P_{N{H}_3}={P_{H_{2}S}}_{ }$  (P is partial pressure)

Partial pressure exerted by NH₄HS towards the total pressure at equilibrium is assumed to be zero. 

Total pressure over  $N{H}_{4}HS$ is  $P_{N{H}_3}+P_{H_{2}S}$

Equilibrium constant for the system is  $P_{N{H}_3}\times P_{H_{2}S}$