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Question

PCl3 on hydrolysis gives fumes of -


A

H3PO3+HCl

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B

H3PO4+HCI

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C

H3PO2andH3PO3

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D

H3PO2+HCl

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Solution

The correct option is A

H3PO3+HCl


Explanation for the correct option:

Option (A):H3PO3+HCl

  • A hydrolysis reaction is known as any chemical reaction in which a molecule of water reacts with other molecules to form their respective acids, hence it is the opposite of a condensation reaction.
  • Phosphorus trichloride (PCl3) undergoes the reaction with water forming Ortho phosphorous acid, along with the formation of Hydrochloric acid.
  • The chemical equation for the above hydrolysis reaction can be given as :

PCl3(l)(Phosphorustrichloride)+3H2O(l)waterH3PO3(s)Orthophosphorousacid+3HCl(g)Hydrochloricacid

Explanation for the incorrect option:

Option (B):H3PO4+HCI

  • PCl3 on hydrolysis does not produce the fumes of H3PO4andHCI.
  • Hence, the given option is the incorrect one.

Option (C):H3PO2andH3PO3

  • H3PO2andH3PO3are not the fumes produce on hydrolysis of PCl3.
  • Thus, the given option does not coincide with the given concept.

Option (D):H3PO2+HCl

  • PCl3 on hydrolysis does not produce the fumes of H3PO2andHCl..
  • Hence, the given option does not represent the correct concept.

Hence,PCl3 on hydrolysis gives fumes of H3PO3+HCl.


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