A student was given Mg, Fe, Zn, and Au metals. Identify the metal from the following that will not produce hydrogen gas on reaction with dil. HCl.

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Solution

The correct option is B Au
Metals such as magnesium, zinc, and iron are more reactive than hydrogen. Hence, they displace hydrogen from dilute acids and release hydrogen gas.

Gold is less reactive than hydrogen and fails to displace hydrogen from dilute acids. Thus, Au (gold) can't produce hydrogen gas on reaction with dil. HCl.

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