MCQ
The number of hydroxyl group$(s)$ in $Q$ is


- A$1$
- B$2$
- C$3$
- ✓$4$


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| List $I$ Complex | List $II$ $CFSE(\Delta_0)$ |
| $A$ $\left[ Cu \left( NH _3\right)_6\right]^{2+}$ | $I$ $-0.6$ |
| $B$ $\left[\operatorname{Ti}\left( N _2 O \right)_6\right]^{3+}$ | $II$ $-2.0$ |
| $C$ $\left[ Fe ( CN )_6\right]^{3-}$ | $III$ $-1.2$ |
| $D$ $\left[ NiF _6\right]^{4-}$ | $IV$ $-0.4$ |
Choose the correct answer from the options given below:
$Hg_2^{2 + } \to \,H{g^{2 + }}+ Hg\left( l \right)$
($en=$ ethylenediamine)
(The atomic mass of $Na$ is $23\, g / mol$ ) :