MHT CET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
Identify the method used to obtain \(\mathrm{SO}_2\) gas in industry.
- A By burning sulphur in air
- B By treating sodium sulphite with dil. sulphuric acid
- C By treating sodium sulphite with dil. hydrochloric acid
- D By roasting zinc sulphide and iron pyrites
Answer & Solution
Correct Answer
(D) By roasting zinc sulphide and iron pyrites
Step-by-step Solution
Detailed explanation
In industry, sulphur dioxide can be prepared by roasting zinc sulphide and iron pyrites.
\(\begin{aligned}
& 2 \mathrm{ZnS}_{(\mathrm{s})}+3 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{SO}_{2(\mathrm{~g})} \\
& 4 \mathrm{FeS}_{2(\mathrm{~s})}+11 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})}+8 \mathrm{SO}_{2(\mathrm{~g})}
\end{aligned}\)
\(\begin{aligned}
& 2 \mathrm{ZnS}_{(\mathrm{s})}+3 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{SO}_{2(\mathrm{~g})} \\
& 4 \mathrm{FeS}_{2(\mathrm{~s})}+11 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})}+8 \mathrm{SO}_{2(\mathrm{~g})}
\end{aligned}\)
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