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Question

Which of these is a pair of isobar?

A
6C12, 8O16
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B
6C13, 6C14
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C
20Ca40, 18Ar40
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D
None of these
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Solution

The correct option is C 20Ca40, 18Ar40
Isobars are atoms of different chemical elements that have the same number of nucleons. Isobars differ in atomic number but have the same mass number.
Hence, option C is correct as both elements have the same atomic mass, i.e., 40 but a different atomic number.

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