NEETChemistryPractical Chemistry
Match List I with List II. List-I (Anion) List-II (gas evolved on reaction with dil. H 2 SO 4 ) (A) CO 3 2 - (I) Colourless gas which turns lead acetate paper black. (B) S 2 - (II) Colourless gas which turns acidified potassium dichromate solution green. (C) SO 3 2 - (III) Brown fumes which turns acidified KI solution containing starch blue. (D) NO 2 - (IV) Colourless gas evolved with brisk effervescence, which turns
Options
- AA - III , B - I , C - II , D - IV
- BA - II , B - I , C - IV , D - III
- CA - IV , B - I , C - III , D - II
- DA - IV , B - I , C - II , D - III
Correct answer
D. A - IV , B - I , C - II , D - III
Step-by-step solution
When small amount of carbonate salt is treated with dilute H 2 SO 4 or dilute HCl , A colourless, odourless gas CO 2 is evolved with brisk effervescence When small amount of the following salts are treated with dilute H 2 SO 4 the following observations are seen. Carbonate salt CO 3 2 − Brisk effervescence of CO 2 gas, CO 3 2 − + H 2 SO 4 → SO 4 2 − + H 2 O + CO 2 ↑ Sulphide salt S - 2 A colourless gas H 2 S with rotten egg smell Na 2 S + H 2 SO 4 → Na 2 SO 4 + H 2 S ↑ NO 2 – on reaction with dilute H 2 SO 4 will g