Correct Answer: Zinc
Subject: chemistry
Explanation: • <b>Key Fact</b> Certain active metals like Zinc (Zn) react with strong bases like Sodium Hydroxide (NaOH) to produce Hydrogen gas. • <b>Supporting Detail</b> The specific reaction is: Zn + 2NaOH → Na₂ZnO₂ (Sodium zincate) + H₂↑. • <b>Related Concept</b> Not all metals react with bases to release hydrogen gas; this is a property of amphoteric metals like Zn and Al. • <b>Why wrong options are wrong</b> Copper, Iron, and Gold do not chemically react with NaOH to release hydrogen. • <b>Exam Trick</b> Trick: 'Zanab' (Zn, Al, Pb) elements are amphoteric and uniquely react with bases. • <b>Additional Info</b> Zinc also robustly reacts with strong acids (like HCl) to produce ZnCl₂ and Hydrogen gas.
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