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Question

Concentrated orthophosphoric acid is a syrupy, viscous liquid and this is due to __ bonding.

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Solution

Let us take a look at the structure of H3PO4:
As we can see from the above structure, the Oxygen atom shown to have double bond character acts as a site to accept Hydrogen bonds while the other Hydrogen atoms attached via a single bond to Oxygen atoms can participate in Hydrogen bond. So in all, for every molecule there are 3 donor sites and one acceptor site.

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