Maharashtra State PSC Model Paper 1

Question : 81 of 100

Marks: +1, -0

A metal in which even Iron can float is:

Solution:

Concept:

Mercury:-

It is commonly known as quicksilver and was formerly named hydrargyrum.
Mercury is the only metallic element that is liquid at room temperature.
Mercury occurs in deposits throughout the world mostly as cinnabar (mercuric sulfide).
Mercury is used in -
- thermometers , barometers , manometers , sphygmomanometers , float valves , mercury switches, mercury relays, fluorescent lamps etc.
Mercury dissolves many metals such as gold and silver to form amalgams.

Mercury is so dense that even iron can float on it

\ρ_{\;\text "mercury "\;}=13.6 {g} {/} {cm}^{3}=13.6 × 1000=13600 {kg}{/} {m}^{3}

\ρ_{\;\text "iron "\;}=7.8 {gm} {/} {cm}^{3}=7.8 × 1000=7800 {kg} {/} {m}^{3}

Iron Floats on mercury but sink in water due to the density of mercury is greater than Iron but less than water.

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