JEE Main · 2023 · 06 Apr 2023 · Shift 2 · p-Block Elements

Which one of the following elements will remain as liquid inside pure boiling water?

(A)Cs
(B)Ga✓ Correct
(C)Li
(D)Br

Answer: (B)

Solution

Pure boiling water is at 100°C. Li and Cs react vigorously with water, so they cannot remain as liquid.

Br_{2}

has a boiling point of 58°C, so it will vaporize in boiling water. Gallium (Ga) has a melting point of 29°C and a boiling point of 2400°C. It melts well below 100°C and remains liquid at 100°C. Ga reacts with water only above 100°C, so it will remain as a liquid metal in boiling water.

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option

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