Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) JEE Main 2021 - S Block Single Correct MCQ
Published on: August 12, 2026

Choose the correct statement from the following :

A
The standard enthalpy of formation for alkali metal bromides becomes less negative on descending thegroup.
B
The low solubility of CsI CsI in water is due to its high lattice enthalpy.
C
Among the alkali metal halides,LiF is least soluble in water.
D
LiFhas least negative standard enthalpy of formation among alkali metal fluorides.

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The correct answer is:
C

Standard enthalpy of formation for alkali metal bromides becomes more negative on desending down the group.

In case of CsI, lattice energy is less, but Cs + is having less hydration enthalpy due to which it is less soluble in water.

For alkali metal fluorides, the solubility in water increases from lithium to caesium. LiF is least soluble in water.

Standard enthalpy of formation for LiF is most negative among alkali metal fluorides.

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