A student was given Mn, Zn, Fe and Cu metals. Identify which of them Will give H2 with 5% HNO3. Write the chemical reactions involved.
Question
A student was given Mn, Zn, Fe and Cu metals. Identify which of them Will give H2 with 5% HNO3. Write the chemical reactions involved.
Solution
The metals that will react with 5% HNO3 to produce H2 are Mn, Zn, and Fe. Cu does not react with dilute HNO3 to produce H2 because it is less reactive than hydrogen.
The reactions are as follows:
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Manganese (Mn) with Nitric Acid (HNO3): Mn(s) + 2HNO3(aq) → Mn(NO3)2(aq) + H2(g)
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Zinc (Zn) with Nitric Acid (HNO3): Zn(s) + 2HNO3(aq) → Zn(NO3)2(aq) + H2(g)
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Iron (Fe) with Nitric Acid (HNO3): Fe(s) + 2HNO3(aq) → Fe(NO3)2(aq) + H2(g)
In each of these reactions, the metal reacts with nitric acid to form a nitrate and hydrogen gas.
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