Group 18 - noble gases and xenon compounds — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Noble gases are placed in Group 18 because they generally have

• A. filled valence shells
• B. one valence electron
• C. two p electrons only
• D. half-filled d subshells

Question 2 · difficulty L2 · understanding

Give below are two statements: Statement - I: Noble gases have very high boiling points. Statement - II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points. In the light of the above statements, choose the correct answer from the options given below:

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

Question 3 · difficulty L2 · understanding

Why are noble gases generally chemically unreactive?

• A. Their valence shells are especially stable and they have high ionisation enthalpies
• B. They readily lose one electron
• C. They have very low ionisation enthalpies
• D. They contain no electrons

Question 4 · difficulty L2 · understanding

Xenon can form compounds more readily than lighter noble gases mainly because xenon has

• A. lower ionisation enthalpy and a more polarisable electron cloud
• B. a smaller atomic radius than helium
• C. no valence electrons
• D. an incomplete first shell

Question 5 · difficulty L3 · understanding

The difference in the oxidation state of $$\mathrm{Xe}$$ between the oxidised product of $$\mathrm{Xe}$$ formed on complete hydrolysis of $$\mathrm{XeF}_{4}$$ is ___________

Question 6 · difficulty L3 · understanding

$$\mathrm{XeF}_{4}$$ reacts with $$\mathrm{SbF}_{5}$$ to form $$[\mathrm{XeF}_{m}]^{\mathrm{n}+}\left[\mathrm{SbF}_{y}\right]^{z-}$$. $$\mathrm{m}+\mathrm{n}+\mathrm{y}+\mathrm{z}=$$ __________

Question 7 · difficulty L3 · understanding

A xenon compound 'A' upon partial hydrolysis gives XeO 2 F 2 . The number of lone pair of electrons present in compound A is _________. (Round off to the Nearest Integer)

Question 8 · difficulty L3 · understanding

At 143 K, the reaction of XeF 4 with O 2 F 2 produces a xenon compound Y. The total number of lone pair(s) of electrons present on the whole molecule of Y is .................

Question 9 · difficulty L3 · understanding

Argon is used in arc welding because of its

• A. low reactivity with metal
• B. ability to lower the melting point of metal
• C. flammability
• D. high calorific value

Question 10 · difficulty L3 · understanding

The structure of XeO$$_3$$

• A. linear
• B. planar
• C. pyramidal
• D. T-shaped