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Q.

The following are some statements about HNO2 
i) Its undissociated forms are tautomers. 
ii) Its undissociated forms are resonance structures. 
iii) Its anhydride in pure state exists as pale blue solid and that melts to deep blue liquid. 
The correct combination is

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a

All are correct

b

i, ii are correct

c

ii, iii are correct

d

i, iii are correct

answer is B.

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Detailed Solution

Undissociated forms of HNO2 are tautomers but not isomers

Question Image

Anhydride of HNO2 is N2O3, which is a blue coloured acidic oxide.

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