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Q.

Regarding H2S2O5 , incorrect is

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a

Sulphur with  '+3' state is in I- excited state

b

Sulphur with '+5' state is in II- excited state

c

Only on one sulphur atom a lone pair is present

d

There are 8 sigma, 2 pi bonds and 10 lone pairs

answer is D.

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Detailed Solution

I - excited state configuration of 'Sulphur'Represents "+3" (or) "+4" state, tetravalency;One dπ-pπ bond and one lone pair on sulphur atom;              II - excited state configuration of 'Sulphur'Represents '+5' (or) '+6' state,hexavalencyTwo dπ-pπ bonds, no lonepair on Sulphur atom+3 -- In I-excited state+5-- In II-excited stateThere are  8σ,3π bonds and 11 lone pairs
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Regarding H2S2O5 , incorrect is