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Question

Which of the following pairs are isodiaphers?

A
29Cu65 and 24Cr55
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B
29Cu65 and 24Cr52
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C
92U238 and 90Th231
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D
92U235 and 90Th232
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Solution

The correct option is C 29Cu65 and 24Cr55
Isodiaphers are atoms, having the different atomic number and mass number but have the same difference between a number of neutron and number of a proton.
No of neutrons is Chromium(Cr55) =31
Difference in no of neutrons & protons = 31-24 = 7
No of neutrons in Copper(Cu65) = 36
Difference in no of neutrons & protons = 36-29= 7
Option A is correct.

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