MCQ
The concentration of hydrogen ion in water is
- A$8$
- ✓$1 \times {10^{ - 7}}$
- C$7$
- D$1/7$
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$Na _{2} O , As _{2} O _{3}, N _{2} O , NO$ and $Cl _{2} O _{7}$
Number of amphoteric oxides is ..... .