Which of the following metals does NOT liberate hydrogen in reaction with acids?
Correct answer: B. Pt
- A. Mg
- B. Pt
- C. Zn
- D. Ca
Explanation
The metal that does not liberate hydrogen in reaction with acids is gold (Au). Gold is a noble metal and is generally unreactive with most acids, including hydrochloric acid (HCl) and sulfuric acid (H2SO4), which are commonly used in acid-metal reactions. Unlike more reactive metals like zinc (Zn) or magnesium (Mg), gold does not undergo a displacement reaction with acids to produce hydrogen gas. Metals exhibit displacement reactions based on their reactivity. All the metals Mg, Zn, and Ca in options A, C, and D respectively are above Hydrogen in the reactivity series and therefore will displace it from acid. Platinum, however, is below hydrogen and so will not displace it and will not liberate H2 gas on reaction with an acid. Therefore option C is the correct answer. The reactivity series of metals is given below:
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