H3PO3 can be represented by structures 1 and 2 shown below. 

ncert solutions for class 11 chemistry chapter 4

These two structures cannot be taken as the canonical forms of the resonance hybrid, because  : 

1. The positions of the atoms have changed.

2. The positions of the atoms are constant.

3. H3PO3 does not show resonance.

4. Two hydrogen atoms are missing.

Subtopic:  Resonance & Nature of Compounds |
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The number of resonating structures exhibited by CO32- ion are

1. 2

2. 3

3. 4

4. 5

Subtopic:  Resonance & Nature of Compounds |
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