Roasting of sulphides gives the gas X as a by product. This is colourless gas with choking smel of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. It aqueous solution is acidic, acts as reducing agent and its acid has never been isolated. The gas X is:

Match the compounds of Xe in column I with the molecular structure in column II.

Among Group 16 elements, which one does NOT show –2 oxidation state?

Given below are two statements:
Statement I: The boiling point of hydrides of group 16 elements follow the order

Statement II: On the basis of molecular mass expected to have boiling point than the other members of the group but due to the presence of extensive H-bonding in it has higher boiling point.
In the light of the above statements, chose the correct answer the option given below:

Among the following, the correct order of acidity is:

The correct structure of tribromooctaoxide is

Given below are two statements
Statement I   Ozone is thermodynamically stable with respect to oxygen.
Statement II Decomposition of ozone into oxygen results in the liberation of heat
In the light of the above statements, choose the most appropriate answer from the options given below :

Match the following:

Which of the following is the correct option?
(A) (B) (C) (D)

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): ICI is more reactive than I₂.
Reason (R): I-CI bond is weaker than I-I bond.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

Match the compounds of Xe in column I with the molecular structure in column II.