Ncert Exercises & Solutions

The element which exists in a liquid state for a wide range of temperatures and can be used for measuring high temperature is:

1.	B	2.	Al
3.	Ga	4.	In

Hint: Element has lowest melting point atomic number is 31

In gallium, the crystal structure is different, suggesting that Ga consists of an almost discrete Ga₂ molecule, which is why its melting point is the lowest. Ga exists as a liquid from

30 ° C

up to

2000 ° C

and it is used in high-temperature thermometry.

Hence, the correct option is the third option.

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