MCQ
Of the following species the one having a square planar structure is
- A$NH_4^ + $
- B$BF_4^ - $
- ✓$Xe{F_4}$
- D$SC{l_4}$

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$NH_4HS(s) \rightleftharpoons NH_3(g)+H_2S(g)$
is following to set up at $127\,^oC$ in a closed vessel. The total pressure at equilibrium was $20\,atm$ . The $K_C$ for the reaction is