MCQ
Which of the following sequence represents atomic number of only representative elements?
- A$55, 12, 48, 53$
- B$13, 33, 54, 83$
- ✓$3, 33, 53, 87$
- D$22, 33, 55, 66$
Sequence $C$ option contains only representative elements.
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${H_2}O + {H_2}PO^-_4 \rightleftharpoons {H_3}{O^ + } + HPO_4^{ - 2}$
Select out the group of acidic species lying on the right side of the equilibrium

Which one of the following options represents identical molecules?