Q44 / 150 · MHT CET 2023 (10 May Shift 1) · Chemistry

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
  • Correct answer
    D
    By roasting zinc sulphide and iron pyrites

Solution

In industry, sulphur dioxide can be prepared by roasting zinc sulphide and iron pyrites. $\begin{aligned} & 2 \mathrm{ZnS}_{(\mathrm{s})}+3 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{SO}_{2(\mathrm{~g})} \\ & 4 \mathrm{FeS}_{2(\mathrm{~s})}+11 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})}+8 \mathrm{SO}_{2(\mathrm{~g})} \end{aligned}$

Hence, the correct answer is option: 'D'.

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