Which of the following is correct? - Vidyadip

MCQ

Which of the following is correct?

A
There are $78$ neutrons in ${ }_{78} \mathrm{Pt}^{192}$
B
$ { }_{84} \mathrm{Po}^{214} \rightarrow{ }_{82} \mathrm{~Pb}^{210}+\beta $
✓
$ 92 \mathrm{U}^{238} \rightarrow{ }_{90} \mathrm{Th}^{234}+{ }_2 \mathrm{He}^4 $
D
$ 90 \mathrm{Th}^{234} \rightarrow{ }_{91} \mathrm{~Pa}^{234}+{ }_2 \mathrm{He}^4$

✓

Answer

Correct option: C.

$ 92 \mathrm{U}^{238} \rightarrow{ }_{90} \mathrm{Th}^{234}+{ }_2 \mathrm{He}^4 $

After release of helium, there will be decrease in atomic number by $2$ and mass number by $4.$

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