MCQ
Which among the following orders of second $IP$ is correct
- A$Mn > Cr$
- B$Zn > Cu$
- ✓$Na > Cu$
- D$Cr > K$
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$(I)$ $H_5P_3O_{10}$ $(II)$ $H_6 P_4O_{13}$
$(III)$ $H_5P_5O_{15}$ $(IV)$ $H_7P_5O_{16}$
non-cyclic phosphates are