Question

Match List-I with List-II :

List - ISolid salt treated with dil. H2SO4	List - IIAnion detected
(A) effervescence of colourless gas	(I) NO2−
(B) gas with smell of rotten egg	(II) CO32−
(C) gas with pungent smell	(III) S2−
(D) brown fumes	(IV) SO23−

Identify the correct answer from the options given below :

• A. A-II, B-III, C-IV, D-I
• B. A-IV, B-III, C-II, D-I
• C. A-I, B-II, C-III, D-IV
• D. A-II, B-III, C-I, D-IV

Answer 1

The Correct Option is A

This question assesses understanding of anion qualitative analysis. Treatment of a solid salt with dilute sulfuric acid (H$_2$SO$_4$) yields distinct gases based on the anion present:
A. Colorless gas evolution: Suggests carbonate ions (CO$_3^{2-}$). Carbon dioxide (CO$_2$), a colorless, odorless gas, is produced. A-II
B. Gas with a rotten egg odor: Indicates sulfide ions (S$^{2-}$). Hydrogen sulfide (H$_2$S), characterized by its strong rotten egg smell, is generated. B-III
C. Pungent smelling gas: Signifies sulfite ions (SO$_3^{2-}$). Sulfur dioxide (SO$_2$), a colorless gas with a sharp, pungent odor, is formed. C-IV
D. Brown fumes: Points to nitrite ions (NO$_2^-$). Nitrogen dioxide (NO$_2$), a brown, pungent gas, is a product. D-I