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MCQEasyJEE 2023Group 13 Elements

JEE Chemistry 2023 Question with Solution

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

  • A

    Li

  • B

    Ga

  • C

    Cs

  • D

    Br

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: The options are Li, Ga, Cs, and Br.

Find: Which element will remain liquid inside pure boiling water.

Gallium has a melting point of about 29.8 \, \text{^\circ C} and a boiling point far above 100 \, \text{^\circ C}. Therefore, at the temperature of boiling water, gallium is in the liquid state.

Lithium, caesium, and bromine do not satisfy this condition in the same way for pure boiling water.

Therefore, the element that remains liquid inside pure boiling water is Ga. Hence, the correct option is B.

Common mistakes

  • Choosing Br because it is a liquid at room temperature. This is wrong because bromine boils below 100 \, \text{^\circ C}, so it will not remain liquid in boiling water. Check both melting point and boiling point.

  • Assuming all metals are solid in boiling water. This is wrong because Ga has a very low melting point, so it melts well below 100 \, \text{^\circ C}. Compare the temperature range for the liquid state.

  • Confusing 'inside pure boiling water' with room-temperature conditions. This is wrong because the relevant temperature is approximately 100 \, \text{^\circ C} at atmospheric pressure. Evaluate the state of each element at that temperature.

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