Chemistry · p-Block (I) (Grp. 13, 14)

JEE Main 2024 — 6 April, Shift 1 — Question 64

Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II.

Statement I : Gallium is used in the manufacturing of thermometers.

Statement II : A thermometer containing gallium is useful for measuring the freezing point $(256 \mathrm{~K})$ of brine solution.

In the light of the above statement, choose the correct answer from the options given below :

Option A:
Both Statement I and Statement II are false.
Option B:
Statement I is false but Statement II is true.
Option C:
Both Statement I and Statement II are true.
Option D:
Statement I is true but Statement II is false.
Correct

Answer: D

Step-by-step solution

Statement I is True: Gallium is used in the manufacture of thermometers because it has a high boiling point and expands uniformly over a wide temperature range.

Statement II is False: Gallium has a melting point of about $303\,\text{K}$ ; therefore, it cannot be used to measure low temperatures such as the freezing point of brine ( $256\,\text{K}$ ), since gallium would be in the solid state.

Thus, Statement I is true but Statement II is false.

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 6 April, Shift 1
Subject: Chemistry
Chapter: p-Block (I) (Grp. 13, 14)
Topic: Introduction & Properties of Group 13: Boron Family