Identify a pair of isomorphous substances

The same question, asked 2 times: 23 Apr 2025 S1*, 14 May 2026 S1. Every wording below, oldest first.

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Question 1
23 Apr 2025 S1
95 $Which from following pair of compounds exhibits isomorphism?$
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Question 2
14 May 2026 S1
2 $Identify a pair of isomorphous substances from following.$
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