Group 18 - noble gases and xenon compounds — practice questions

Question 1 · 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 2 · 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 3 · 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 4 · 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 5 · 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 6 · 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 7 · difficulty L3 · understanding

The structure of XeO$$_3$$

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

Question 8 · difficulty L3 · understanding

XeF$$_4$$ and XeF$$_6$$ are expected to be

• A. oxidizing
• B. reducing
• C. unreactive
• D. strongly basic

Question 9 · difficulty L3 · understanding

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Helium is used to dilute oxygen in diving apparatus. Reason R : Helium has high solubility in O$$_2$$. In the light of the above statements, choose the correct answer from the options given below:

• A. Both A and R are true but R is NOT the correct explanation of A.
• B. A is true but R is false.
• C. A is false but R is true.
• D. Both A and R are true and R is the correct explanation of A.

Question 10 · difficulty L3 · understanding

The element expected to form largest ion to achieve the nearest noble gas configuration is

• A. $$\mathrm{F}$$
• B. $$\mathrm{N}$$
• C. $$\mathrm{Na}$$
• D. $$\mathrm{O}$$