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SSC CGL 2020 PYQ — Question 35

SSC CGL - 5th March 2020 Shift 3 • General Awareness • Q35

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Which of the following is used as a substitute for mercury in thermometers?

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Correct answer: C

Explanation

The correct answer is option 3 i.e Galinstan.

  • Due to the low toxicity and low reactivity of its component metals, in many applications, Galinstan has replaced the toxic liquid mercury.

  • The tube interior must be coated with gallium oxide to prevent it from wetting the glass.

  • Galinstan has higher reflectivity and lower density than mercury.