Question:
From the given list of metals, identify the number of metals which do not dissolve in concentrated nitric acid are Cu, Al, Zn, Ni, Fe.
From the given list of metals, identify the number of metals which do not dissolve in concentrated nitric acid are Cu, Al, Zn, Ni, Fe.
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Conc. HNO\(_3\) causes passivation in Al, Fe, Ni due to oxide layer formation.
Updated On: Jun 19, 2026
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The Correct Option is B
Solution and Explanation
Step 1: Understanding behavior of metals with conc. HNO\(_3\).
Concentrated nitric acid is a strong oxidizing agent and generally dissolves most metals, but some metals become passivated or show resistance.
Step 2: Checking each metal.
- Cu: dissolves in HNO\(_3\) → forms Cu\(^{2+}\), so it reacts
- Al: becomes passivated due to protective Al\(_2\)O\(_3\) layer → does not dissolve easily
- Zn: reacts with HNO\(_3\) → dissolves
- Ni: shows passivation in conc. HNO\(_3\) → does not dissolve readily
- Fe: also becomes passivated → does not dissolve
Step 3: Identifying non-dissolving metals.
Metals that do not dissolve: Al, Ni, Fe → total = 3
Step 4: Final reasoning.
Passivation occurs due to formation of protective oxide layers preventing further reaction with acid.
Step 5: Final conclusion.
Hence, number of metals not dissolving = 3.
Final Answer: \[ \boxed{3} \]
Concentrated nitric acid is a strong oxidizing agent and generally dissolves most metals, but some metals become passivated or show resistance.
Step 2: Checking each metal.
- Cu: dissolves in HNO\(_3\) → forms Cu\(^{2+}\), so it reacts
- Al: becomes passivated due to protective Al\(_2\)O\(_3\) layer → does not dissolve easily
- Zn: reacts with HNO\(_3\) → dissolves
- Ni: shows passivation in conc. HNO\(_3\) → does not dissolve readily
- Fe: also becomes passivated → does not dissolve
Step 3: Identifying non-dissolving metals.
Metals that do not dissolve: Al, Ni, Fe → total = 3
Step 4: Final reasoning.
Passivation occurs due to formation of protective oxide layers preventing further reaction with acid.
Step 5: Final conclusion.
Hence, number of metals not dissolving = 3.
Final Answer: \[ \boxed{3} \]
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