MCQ
The most abundant transition metal in earth crust is
- A$Zn$
- ✓$Fe$
- C$Hg$
- D$Au$
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| List $I$ Reaction | List $II$ Reagents |
| $A$ Hoffmann Degradation | $I$ Conc.KOH,$\Delta$ |
| $B$ Clemenson reduction | $II$ $CHCl _3, NaOH / H _3 O ^{+}$ |
| $C$ Cannizaro reaction | $III$ $Br _2, NaOH$ |
| $D$ Reimer-Tiemann reaction | $IV$ $Zn - Hg / HCl$ |
(ii) Silver metal does not react with $1 M$ zinc nitrate solution
(iii) Zinc metal dissolves in $1M$ copper sulphate solution and copper metal gets depositedHence the order of decreasing strength of the three metals as reducing agents will be
$\left([ P ]_0\right.$ is the initial concentration of $P$ )
