Which one of the following pairs of elements is liquid at room tempera

Which one of the following pairs of elements is liquid at room temperature and at normal pressure ?

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Gallium and Bromine

Mercury and Bromine

Gallium and Mercury

Gallium and Caesium

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC NDA-2 – 2021

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At standard room temperature (approximately 25°C) and normal pressure, only two elements are liquids: Mercury (Hg), a metal, and Bromine (Br₂), a non-metal.

– Mercury is the only metallic element that is liquid at room temperature.
– Bromine is the only non-metallic element that is liquid at room temperature.
– Gallium (melting point 29.8 °C) and Caesium (melting point 28.5 °C) melt just above typical room temperature but are usually considered solid at 25°C.

While Gallium and Caesium have very low melting points and can melt in slightly warmer conditions or even in the hand, Mercury and Bromine are consistently liquid under standard room temperature conditions.

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