defence exam Agniveer Army GD Mock Test Series 2025 General Science Chemistry

સૌથી હલકું કિરણોત્સર્ગી તત્વ કયું છે?

1
ડ્યુટેરિયમ
2
પોલોનિયમ
3
ટ્રિટિયમ
4
યુરેનિયમ
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