MCQ
निम्नांकित में रेडॉक्स अभिक्रिया कौन है?
- A$\mathrm{Pb}(\mathrm{s})+\mathrm{CuCl}_{2}(\mathrm{aq}) \rightarrow \mathrm{PbCl}_{2}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$
- B$\mathrm{CaCO}_{3}(5) \rightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{g})$
- C$\mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})+\mathrm{BaCl}_{2}(\mathrm{aq}) \rightarrow \mathrm{BaSO}_{4}(\mathrm{s})+2 \mathrm{NaCl}(\mathrm{aq})$
- ✓$\mathrm{MnO}_{2}(\mathrm{s})+4 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MnCl}_{2}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{Cl}_{2}$