Most elements are solids at 25 $^{o}$ C and 1 atm pressure, the exception being the 11 elements that are gases and 2 that are liquids. What 2 elements are liquids?

Hg and Br

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Hg and I

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Ag and Kr

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Au and Kr

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Pt and Co

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Solution

The correct option is A Hg and Br
At room temperature, that is $25^{o} C$ and $1$ atm, Mercury and Bromine both exist as liquids. Hence option A gives the correct pair.
Iodine, Silver, Platinum, Cobalt are all solid at room temperature. Whereas, Krypton is a gas at room temperature.

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Identify the element(s) that are liquid at room temperature and pressure.

25^{o} C

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