can be represented by structures 1 and 2 shown below.
These two structures cannot be taken as the canonical forms of the resonance hybrid, because :
1. | The positions of the atoms have changed.
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2. | The positions of the atoms are constant.
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3. | H3PO3 does not show resonance.
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4. | Two hydrogen atoms are missing. |
The number of resonating structures exhibited by CO32- ion are :
1. 2
2. 3
3. 4
4. 5