- AThird period
- ✓Fourth period
- CFifth period
- DNone of these
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|
LIST $-I$ (Cell) |
LIST $-II$ (Use/Property/Reaction) |
|
$A$ Leclanche cell |
$I$ Converts energy of combustion into electrical energy |
| $B$ Ni-Cd cell | $II$ Does not involve any ion in solution and is used in hearing aids |
| $C$ Fuel cell | $III$ Rechargeable |
|
$D$ Mercury cell |
$IV$ Reaction at anode $\mathrm{Zn} \rightarrow \mathrm{Zn}^{2+}+2 \mathrm{e}^{-}$ |
Choose the correct answer from the options given below:
Statement $(I)$ : In the Lanthanoids, the formation of $\mathrm{Ce}^{+4}$ is favoured by its noble gas configuration.
Statement $(II)$ : $\mathrm{Ce}^{+4}$ is a strong oxidant reverting to the common $+3$ state.
In the light of the above statements, choose the most appropriate answer from the options given below:
Assertion $(A)$: There is a considerable increase in covalent radius from $\mathrm{N}$ to $\mathrm{P}$. However from $As$ to $Bi$ only a small increase in covalent radius is observed.
Reason $(R)$: covalent and ionic radii in a particular oxidation state increases down the group.
In the light of the above statement, choose the most appropriate answer from the options given below:
According the Werner's theory.
$(1)$ Ligands are connected to the metal ions by covalent bonds.
$(2)$ Secondary valencies have directional properties
$(3)$ Secondary valencies are non-ionisable
Of these statements :
