Question

Pure phosphoric acid is very viscous because:
(1) it is a strong acid
(2) it is tribasic acid
(3) it is hygroscopic
(4) it has PO4 3- groups which are bonded by many hydrogen bonds

Answer 1

(4)

same reason for high boiling point also!!

Answer 2

Pure phosphoric acid is very viscous because it has $PO_4 ^3^$ groups which are bonded by many hydrogen bonds.

Option (4)

Explanation:

• Phosphoric acid is an acid which is weak in nature and is also referred to as Orthophosphoric acid.

• It has the chemical composition of $H_3PO_4.$

• It has the ions $3 H^+$ ions and $PO_ 4^3^-$ion in its compound and these ions are bonded together to form the molecule of Phosphoric acid.

• The ion $PO_4 ^3^-$ is bonded with three $H^+$ ions with the hydrogen bonds and all these bonds are hydrogen bonds.

• So due to this the compound is very viscous in nature.

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