MCQ
Which of the following complex can shows coordination isomerism :-
- A$[Pt(H_2O)_6] (SO_4)_2$
- ✓$[Co(en)_3] [Cr(CN)_6]$
- C$[Co(NH_3)_5 ONO]Cl_2$
- D


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(Rounded-off to the nearest integer) $\left[ K _{ b }=0.52 \,K \,kg\, mol ^{-1}\right]$

Statement $I$ : Picric acid is $2, 4, 6$-trinitrotoluene.
Statement $II$ : Phenol$-2, 4-$disulphuric acid is treated with conc. $\mathrm{HNO}_3$ to get picric acid.
In the light of the above statement, choose the most appropriate answer from the options given below :