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S.No. Column-I S.No. Column-II
A) Isotones i) K = 40 and Ca - 40
B) Isotopes ii) U - 235 and Th - 231
C) Isobars iii) Protium and Tritium
D) Isodiaphers iv) C - 14 and O - 16

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A - i, B - ii, C - iii, D - iv

A - iii, B - ii, C - iv, D - i

A - iv, B - iii, C - i, D - ii

A - ii, B - iii, C - i, D - iv

answer is B.

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Detailed Solution

Isotones: elements having same number of neutrons

Isotopes: Atoms having same atomic no. but different mass no.

Isobars: Atoms having same mass no. but different atomic no.

Isodiaphers: elements having same number of |A-2Z|

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