Correct Answer: A
Explanation:
Sol. Mercury is a chemical element with the symbol (Hg). Mercury is used in thermometers due to its special properties. It can measure a wide range of temperatures from – 40 to 356°C and up to 570°C under pressure in a liquid state. It expands changes. A heavy, silvery d-block element, mercury is the only metallic element which is found in liquid state at standard conditions for temperature and pressure.