Identify the correct pair of elements among the following which are li

Identify the correct pair of elements among the following which are liquid at room temperature and standard pressure.

[amp_mcq option1=”Bromine and fluorine” option2=”Mercury and rubidium” option3=”Bromine and thallium” option4=”Bromine and mercury” correct=”option4″]

This question was previously asked in

UPSC CDS-2 – 2020

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At room temperature (typically 20-25°C) and standard pressure (1 atm), only two elements are liquid: Bromine (Br₂) and Mercury (Hg). Bromine is a reddish-brown volatile liquid that exists as diatomic molecules (Br₂). Mercury is a silvery-white heavy metal.

Bromine and Mercury are the only two elements that exist as liquids under standard conditions of temperature and pressure.

Fluorine (F₂) is a pale yellow gas at room temperature. Rubidium (Rb) is an alkali metal that is solid at room temperature but has a low melting point (39.3 °C). Thallium (Tl) is a metal that is solid at room temperature. Some other elements like Gallium (Ga), Cesium (Cs), and Francium (Fr) melt at temperatures slightly above typical room temperature but are often considered liquids at slightly elevated room temperatures or in warm environments. However, only Bromine and Mercury are liquid under *standard* room temperature conditions.

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