After 1 $α -$ and 2 $β -$ emissions

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mass number reduces by 6

mass number increases by 4

mass number reduces by 4

mass number reduces by 5

answer is A.

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Detailed Solution

Emission of 1 $α -$ particle leads to decrease in atomic number by 2 while mass number by 4. On the other hand, emission of $2 β -$ particles increases atomic number by 2. Hence, overall emission of, 1 $α -$ and 2 $β -$ particles leads to decrease in mass number by 4.

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