Match the List-I and List-II and select the correct answer using the codes given below the lists:
List-I
Isotope List-II
Characteristics
$(A)$ $_{20}^{40} C a$ $(i)$ Unstable, $α$ -emitter
$(B)$ $_{53}^{133} I$ $(i i)$ Unstable, $β$ -emitter
$(C)$ $_{53}^{121} I$ $(i i i)$ Unstable, positron emitter
$(D)$ $_{90}^{232} T h$ $(i v)$ Stable

A - i, B - i i, C - i i i, D - i v

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A - i, B - i i i, C - i i, D - i v

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A - i v, B - i i i, C - i i, D - i

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A - i v, B - i i, C - i i i, D - i

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Solution

The correct option is B $A - i v, B - i i, C - i i i, D - i$
In order to find the kind of emission we need determine the nearest stable isotopes:
$_{20}^{40} C a$ is stable due to no nuclide excess.
$_{53}^{133} I$ will emit $β$ particle to try and balance neutron excess.
$_{90}^{232} T h$ will emit even number nucleides so it will emit $α -$ particles.

Suggest Corrections

Column-I	Column-II
$(A)$ $_{6}^{14} C$	$(i)$ Unstable and $β$ -emitter
$(B)$ $_{11}^{24} N a$	$(i i)$ Stable
$(C)$ $_{7}^{13} N$	$(i i i)$ Unstable, positron emitter
$(D)$ $_{6}^{13} C$	$(i v)$ Unstable, $α$ -emitter

List-I Isotope	List-II Characteristics
$(A)$ $_{20}^{40} C a$	$(i)$ Unstable, $α$ -emitter
$(B)$ $_{53}^{133} I$	$(i i)$ Unstable, $β$ -emitter
$(C)$ $_{53}^{121} I$	$(i i i)$ Unstable, positron emitter
$(D)$ $_{90}^{232} T h$	$(i v)$ Stable