MCQ
Which of the following is true for electrolytic refining?
- APure metal is used at anode and impure metal at cathode.
- BPure metal is used at cathode and impure metal at anode.
- CBoth can be possible A and B.
- DNone of these.
Explanation:
Impure metal will release electron hence form anode electrode and pure metal will absorb electron hence it will be posses as cathode electrode. Pure metal is used as the cathode and impure metal as anode.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

| Aspects | Metal |
| $(a)$ The metal which reveals a maximum number of oxidation states | $(i)$ Scandium |
| $(b)$ The metal although placed in $3 d$ block is considered not as a transition element | $(ii)$ Copper |
| $(c)$ The metal which does not exhibit variable oxidation states | $(iii)$ Manganese |
| $(d)$ The metal which in $+1$ oxidation state in aqueous solution undergoes disproportionation | $(iv)$ Zinc |
Select the correct option
$(a)$ Lewis acidity order : $SiF_4 < SiC_{4} < SiBr_4 < Sil_4$
$(b)$ Melting point : $NH_3 > SbH_3 > AsH_3 > PH_3$
$(c)$ Boiling point : $NH_3 > SbH_3 > AsH_3 > PH_3$
$(d)$ Dipole moment order : $NH_3 > SbH_3 > AsH_3 > PH_3$