Metals that melt when taken on human palm are:

Caesium and gallium

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Sodium and potassium

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Aluminium and mercury

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Iron and copper

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Solution

The correct option is A
Caesium and gallium

Caesium and gallium are solids at room temperature but they possess a very low melting point. The melting point of caesium is $28^{\circ} C$ and gallium is $30^{\circ} C$ . The temperature of the human body is $37^{\circ} C$ . Therefore, they melt when kept on palm.

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Metals that melt when taken on human palm are:

The correct option is A Caesium and gallium Caesium and gallium are solids at room temperature but they possess a very low melting point. The melting point of caesium is 28 ∘C and gallium is 30 ∘C. The temperature of the human body is 37 ∘C. Therefore, they melt when kept on palm.