state gov BSSC Laboratory Assistant Mock Test Series 2025 Chemistry Organic Chemistry – Some Basic Principles and Techniques
Identify the method used to obtain SO2 gas in industry.
1
By burning sulphur in air
2
By treating sodium sulphite with dil. sulphuric acid
3
By treating sodium sulphite with dil. hydrochloric acid
4
By roasting zinc sulphide and iron pyrites