Given below are two statements:

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

Statement II: A thermometer containing gallium is useful for measuring the freezing point (256 K) o

Question

Given below are two statements:

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

Statement II: A thermometer containing gallium is useful for measuring the freezing point (256 K) of brine solution.

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

Canvas Classes · Accepted Answer

Statement I: Gallium (m.p. 303 K = 30°C, b.p. 2477 K) has a very wide liquid range, making it useful for high-temperature thermometers. ✓

Statement II: The freezing point of brine is about 256 K (−17°C). However, gallium melts at 303 K (30°C) — it is solid at 256 K. Therefore, a gallium thermometer cannot measure temperatures below its melting point (303 K). Statement II is false. ✗

Answer: Option (4) — Statement I is true but Statement II is false

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