Q.

The total number of isotopes of hydrogen and number of radioactive isotopes among them,
respectively, are

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a

2 and 1

b

2 and 0

c

3 and 1

d

3 and 2

answer is A.

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Detailed Solution

Hydrogen has three isotopes, Protium ,Duterium and tritium . 

Among all only tritium is radio active. 

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