MCQ
The correct increasing order of basic strength for the following compounds is __________ .

- AIII < I < II
- ✓III < II < I
- CII < III < I
- DII < I < III

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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:
Reason : In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.