MCQ
निम्नांकित में कौन क्षारकीय ऑक्साइड है?
- A$SO_{2}$
- B$\mathrm{NO}_{2}$
- C$\mathrm{P}_{2} \mathrm{O}_{5}$
- ✓$\mathrm{Na}_{2} \mathrm{O}$
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