Indian Navy AA (Artificer Apprentice) Metals & Non-metals — practice questions

Explore 2 free Metals & Non-metals questions in Indian Navy AA (Artificer Apprentice) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Metals & Non-metals questions and exercises with answers

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Which acid generally does NOT give hydrogen gas on reacting with metals (except Mn, Mg)?Read the answer and worked solution →In the reactivity series, which metal would be displaced from its salt solution by all of Fe, Zn and Al?Read the answer and worked solution →

Worked practice questions

Which acid generally does NOT give hydrogen gas on reacting with metals (except Mn, Mg)?

hydrochloric acid
sulphuric acid (dilute)
acetic acid
nitric acid (HNO₃)

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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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In the reactivity series, which metal would be displaced from its salt solution by all of Fe, Zn and Al?

copper
potassium
magnesium
calcium

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Correct answer: A. copper

A metal is displaced by metals above it in the reactivity series. Cu is below Fe, Zn and Al, so all three can displace copper from CuSO₄. Mg, Ca, K are all above them.