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Which acid generally does NOT give hydrogen gas on reacting with metals (except Mn, Mg)?
Ahydrochloric acid
Bsulphuric acid (dilute)
Cacetic acid
Dnitric acid (HNO₃)
Answer & Solution
Correct answer: D. nitric acid (HNO₃)
HNO₃ is a strong oxidiser; it oxidises the H₂ produced to water, so metals (except Mn, Mg with very dilute HNO₃) give oxides/nitrogen oxides instead of H₂.
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