MCQ
In $Cl_2O_7$ the $\pi$ -bond between $Cl-O$ is formed by the over lapping of :-
- ✓$sp^3-2p$
- B$3p-2p$
- C$sp^3-sp^3$
- D$3d-2p$
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Assertion $A:$ The spin only magnetic moment value for $\left[ Fe ( CN )_6\right]^{3-}$ is $1.74 BM$, whereas for $\left[ Fe \left( H _2 O \right)_6\right]^{3+}$ is $5.92\,BM$.
Reason $R :$ In both complexes, $Fe$ is present in +3 oxidation state.
In the light of the above statements, choose the correct answer from the options given below:
$I = -3.04\,V$,
$II = -1.90\,V$,
$III = 0\,V$,
$IV = 1.90\,V$