MCQ
निम्नलिखित में त्रि$-$भस्मीय कौन है?
- A$\mathrm{H}_3 \mathrm{PO}_2$
- B$\mathrm{H}_3 \mathrm{PO}_3$
- C$\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7$
- ✓$\mathrm{H}_3 \mathrm{PO}_4$
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