Ncert Exercises & Solutions

Which of the following statements is/are true?

a.	Only types of interactions between particles of noble gases are due to weak dispersion forces.
b.	The ionization enthalpy of molecular oxygen is very close to that of xenon.
c.	Hydrolysis of XeF₆ is a redox reaction.
d.	Xenon fluorides are not reactive.

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: Fluoride of xenon is reactive and reacts with water

(a) Only one type of interaction between particles of noble gases is due to weak dispersion forces. Hence, first statement is correct.

(b) Ionization enthalpy of molecular oxygen is very close to that of xenon. The first ionization enthalpy of molecular oxygen (1175 kJmol^–1) was almost identical to that of xenon (1170 kJ mol^–1). Thus, the second statement is also correct.

(c) The hydrolysis reaction of XeF₆ is as follows:

XeF₆ + 3 H₂O → XeO₃ + 6 HF

The oxidation state of Xe, F, H, and O atoms does not change hence, it is not a redox reaction.

Hence, the third statement is incorrect.

(d) Xenon fluorides are highly reactive hydrolysis readily even by traces of water. The reactions of xenon fluoride are as follows:

XeF₆ + H₂O → XeOF₄ + 2HF
XeF₆ + 2 H₂O → XeO₂F₂ + 4HF

Thus, option first is the correct answer

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