MCQ
Transition elements in lower oxidation states act as Lewis acid because
- ✓they form complexes
- Bthey are oxidising agents
- Cthey donate electrons
- Dthey do not show catalytic properties
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| List$-I ($Molecule$)$ | List$-II($Shape$)$ | ||
| $A.$ | $NH_3$ | $I.$ | Square pyramid |
| $B.$ | $BrF_5$ | $II.$ | Tetrahedral |
| $C.$ | $PCl_5$ | $III$ | Trigonal pyramidal |
| $D.$ | $CH_4$ | $IV$ | Trigonal bipyramida |


Reason : In mercury cell, the electrolyte is a paste of $KOH$ and $ZnO$.