Identify the least reactive metal from the following.

Potassium

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Gold

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Zinc

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Iron

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Solution

The correct option is B Gold
Metals are arranged in a series according to their reactivity and the series if known as the activity series of metals.
Highly reactive metals like potassium, sodium are placed at the top of the reactivity series and metals like copper, silver and gold are at the bottom of the reactivity seriesof which, gold is the least reactive metal.

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