JEE Main 2026 — Jan 28, Shift 2 — Chemistry solution

JEE Main2026Jan 28, Shift 2Chemistry

Given below are two statements :

Statement I : The increasing order of boiling point of hydrogen halides is HCl $<$ HBr $<$ HI $<$ HF.

Statement II : The increasing order of melting point of hydrogen halides is HCl $<$ HBr $<$ HF $<$ HI.

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

A
Both Statement I and Statement II are true
B
Statement I is true but Statement II is false
C
Both Statement I and Statement II are false
D
Statement I is false but Statement II is true

Solution

Boiling points: HF stands out because of strong hydrogen bonding. Among the rest, dispersion forces grow with molar mass: HCl $<$ HBr $<$ HI, and all three are below HF. Order: HCl $<$ HBr $<$ HI $<$ HF. TRUE.

Melting points (in $^{\circ}$ C): HCl $\approx - 114$ , HBr $\approx - 87$ , HF $\approx - 83$ , HI $\approx - 51$ . So HCl $<$ HBr $<$ HF $<$ HI. TRUE.

Both statements are correct.

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