MCQ
The cell constant of a conductivity cell ___________.
- AChanges with change of electrolyte.
- BChanges with change of concentration of electrolyte.
- CChanges with temperature of electrolyte.
- DRemains constant for a cell.
Explanation:
The cell constant of a conductivity cell (i) remains constant for a cell.
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$(I)\,\,La(OH)_3$ is the least basic among hydroxides of lanthanides.
$(II) \,\,Zr^{4+}$ and $Hf^{4+}$ posses almost the same ionic radii.
$(III)\,\,Ce^{4+}$ can as an oxidizing agent
Which of the above is/are true ?

$(i)$ ${A_2} \to A + A$ (fast)
$(ii)$ $A + {B_2} \to AB + B$ (slow)
$(iii)$ $A + B \to $ (fast)