Identify the method used to obtain $\mathrm{SO}_2$ gas in industry.
Identify the method used to obtain $\mathrm{SO}_2$ gas in industry.
- By burning sulphur in air
- By treating sodium sulphite with dil. sulphuric acid
- By treating sodium sulphite with dil. hydrochloric acid
- By roasting zinc sulphide and iron pyrites
Solution
In industry, sulphur dioxide can be prepared by roasting zinc sulphide and iron pyrites.
$\begin{aligned}
& 2 \mathrm{ZnS}_{(\mathrm{s})}+3 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{SO}_{2(\mathrm{~g})} \\
& 4 \mathrm{FeS}_{2(\mathrm{~s})}+11 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})}+8 \mathrm{SO}_{2(\mathrm{~g})}
\end{aligned}$
Asked in: MHT CET 2023 (10 May Shift 1)
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