Identify the pairs which are not

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Question:
Identify the pairs which are not of isotopes?

(i) 6X12, 6Y13

(ii) 17X35, 6Y37

(iii) 6X14, 7Y14

(iv) 4X8, 5Y8

Solution:

Option (iii) 6X14, 7Y14 and (iv) 4X8, 5Y8 are the answers.