Pure phosphoric acid is very viscous. Because:

It is a strong acid

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It is tribasic acid

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It is hygroscopic

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It forms hydrogen bonding

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Solution

The correct option is D It forms hydrogen bonding
Viscosity increases with the increase in the strength of intermolecular forces. Phosphoric acid $(H_{3} P O_{4})$ possess intermolecular $H -$ bonding. Thus it is viscous.

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H -

0.3

H_{2} P O_{4}

(C H_{2} O H C H O H C H_{2} O H)

H_{3} P O_{4}, H_{3} P O_{3}

H_{3} P O_{2}

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