MCQ
Geometrical and optical isomerism exihibted by
- ✓$[Co(en)_2Cl_2]^+$
- B$[Co(NH_3)_5Cl]^{2+}$
- C$[Co(NH_3)_4Cl_2]^+$
- D$[Cr(OX)_3]^{3-}$

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$(a)$ $[Co(en)_2Cl_2]Br$
$(b)$ $[Pt(NH_3)_2Cl_2Br_2]$
$(c)$ $[Co(en)_3]Cl_3$
$(d)$ $[Pt(NH_3)_4Cl_2]$
$(e)$ $[Pt(NH_3)_2Cl_2]$
Which of the above statements are correct?
Assertion $(A)$ : $\mathrm{PH}_3$ has lower boiling point than $\mathrm{NH}_3$.
Reason $(R)$ : In liquid state $\mathrm{NH}_3$ molecules are associated through vander waal's forces, but $\mathrm{PH}_3$ molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below: