MHTCET 25 Apr 2025 Shift 1 Paper

Concept:The Merck process prepares hydrogen peroxide by the acidification of sodium peroxide.Explanation:In the Merck process, cold dilute sulphuric acid is added to aqueous sodium peroxide.The reaction is carried out at low temperature, around $273\ \mathrm{K}$, to prevent decomposition of hydrogen peroxide.The balanced chemical equation is:$$< br> \mathrm{Na}_2\mathrm{O}_2(\mathrm{aq}) + \mathrm{H}_2\mathrm{SO}_4(\mathrm{aq}) \xrightarrow{273\ \mathrm{K}} \mathrm{Na}_2\mathrm{SO}_4(\mathrm{aq}) + \mathrm{H}_2\mathrm{O}_2(\mathrm{aq}) < br>$$Here, sodium peroxide $\mathrm{Na}_2\mathrm{O}_2$ in aqueous form reacts to give hydrogen peroxide.The other options like $\mathrm{CaCO}_3$, $\mathrm{BaO}_2 \cdot 8\mathrm{H}_2\mathrm{O}$, and $\mathrm{CaCl}_2$ are not used in this specific process.Thus, the compound used is aqueous sodium peroxide.Answer:Option D: $\mathrm{Na}_2\mathrm{O}_{2(\mathrm{aq})}$