MCQ
Phosphorus pentachloride in the solid exists as
- A$PCl_5$
- B$PCl_4^+ ,\,Cl^-$
- ✓$PCl_4^ + ,\,PCl_6^ - $
- D$PCl_5.Cl_2$
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At $300 \,K$, ozone is fifty percent dissociated. The standard free energy change at this temperature and $1\, atm$ pressure is $(-)$ $........\,J\, mol ^{-1}$ (Nearest integer)
[Given: $\ln 1.35=0.3$ and $R =8.3 J K ^{-1} mol ^{-1}$ ]
| $I.P.$ | Reason |
| $(A)$ $N > O$ | Half filled configuration |
| $(B)$ $Zr < Hf$ | Lanthenide contraction |
| $(C)$ $Na > K$ | $Z_{eff}$ |
| $(D)$ $Al < Ga$ | Transition contraction |