Asked in Premeth Test 11 — S and P Block, D Block and Chemical Bonding (13 March 2025) 2025Moderate

Heat of solution of LiCl is,

Correct answer: B. Negative

  • A. Positive
  • B. Negative
  • C. Zero
  • D. All

Explanation

The heat of solution refers to the heat change when a solute dissolves in a solvent. For LiCl, the dissolution is an exothermic process, meaning it releases heat. Therefore, the heat of solution is negative, making option B) Negative the correct answer. Options A) Positive and C) Zero are incorrect as they imply either heat absorption or no heat change, respectively, which do not apply to LiCl. Option D) All is incorrect because the options cannot all be correct simultaneously.

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About Reactions of Group I Elements

Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.

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