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Which of the following is a liquid metal?

(a) Gold

(b) Silver

(c) Oxygen

(d) Mercury

This question was addressed to me in an interview for internship.

The doubt is from Major Environmental Problems Associated with Selected Industry Sector topic in chapter Environmental Clearance for Establishing and Operating Industries in India of Energy Management

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Correct option is (d) Mercury

For explanation I would say: Mercury is a liquid metal. It is used in artisanal and small scale gold mining to extract gold from rock and sediment. Mercury reaches rivers, atmosphere, lakes and oceans. The use of mercury in gold mining is causing a global health and environmental crisis.

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