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19. The name of laughing gas is:

September 20, 2025 by Admin

A. Nitric oxide

B. Nitrogen Dioxide

C. Nitrogen pentoxide

D. Nitrous oxide

✅ The correct answer is option Nitrous oxide.

Categories PastPaper 33, PPSC Past Papers Tags PastPaper 33, PPSC MCQs

17. Which word does not belong with the others?

21. Mohammad Bin Qasim attacked Sindh in:

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