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Question

Which of these are pairs of isobar?

A
6C12,8O16
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B
6C13,6O14
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C
20Ca40,18Ar40
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D
None of these
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Solution

The correct option is D 20Ca40,18Ar40
Isobars have the same atomic mass number and different atomic number.

Out of given options, the pair is option 'C'.

20Ca40, 18Ar40, both have same atomic mass number and have different atomic numbers.

Hence, 20Ca40,18Ar40 are isobars .

Thus, the correct answer is 'C'.

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