The Question is from neet-chemistry classification-of-elements , and it was created by the author Mr. S M HUSSAIN

Question

The reaction of $PCl_3$ with water produces:

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Hydrolysis of phosphorus trichloride ($PCl_3$)
 **Related Topics**:  Inorganic chemistry, reactions of non-metal halides, oxidation states of phosphorus
 **Prerequisites**: Understanding of chemical reactions, balancing chemical equations.
## SOLUTION PATHWAY
**Given Information**:
  Reactant: $PCl_3$ (phosphorus trichloride)
  Reactant: $H_2O$ (water)
**Method & Steps**:
 1. Write the unbalanced equation:
  Reasoning: $PCl_3$ reacts with water ($H_2O$) to form an oxoacid of phosphorus and hydrochloric acid ($HCl$).
  Formula/Rule: Hydrolysis of non-metal halides generally results in the formation of an oxoacid and the corresponding hydrohalic acid.
  $PCl_3 + H_2O ightarrow H_3PO_3 + HCl$ (unbalanced)
 2. Balance the equation:
  Working: To balance the equation, we need to ensure the number of atoms of each element is the same on both sides of the equation. We can start by balancing the chlorine atoms.
  $PCl_3 + 3H_2O ightarrow H_3PO_3 + 3HCl$
  Key Point:  The oxidation state of phosphorus remains unchanged (+3) during this reaction.
 3. Identify the products:
  Result: The products of the reaction are phosphorous acid ($H_3PO_3$) and hydrochloric acid ($HCl$).
  Verification: The balanced equation shows that the number of atoms of each element is equal on both sides.
 ## OPTION ANALYSIS
A :x: $H_3PO_4$ is phosphoric acid, which would be formed from the hydrolysis of $PCl_5$, not $PCl_3$.
B ✓: $H_3PO_3$ and $HCl$ are the correct products of the hydrolysis of $PCl_3$.
C :x: $H_4P_2O_7$ is pyrophosphoric acid, which is not formed in this reaction.
D :x: $H_3PO_2$ is hypophosphorous acid, which has a different oxidation state of phosphorus (+1).
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Incorrectly predicting the oxidation state of phosphorus:  Remember the oxidation state of P in $PCl_3$ is +3, which is preserved in $H_3PO_3$.
  2.Balancing the equation incorrectly:  Carefully count the number of atoms of each element on both sides of the equation.
 **Quick Tips**:
  1.Remember the general pattern of non-metal halide hydrolysis: non-metal halide + water → oxoacid + hydrohalic acid.
  2.Use oxidation states to help predict the products.  The oxidation state of the central non-metal atom usually remains the same during hydrolysis.

Mr. S M HUSSAIN · Answer

$H_3PO_4$ and $HCl$

Mr. S M HUSSAIN · Answer

The correct Option is "$H_3PO_3$ and $HCl$"

Mr. S M HUSSAIN · Answer

$H_4P_2O_7$ and $HCl$

Mr. S M HUSSAIN · Answer

$H_3PO_2$ and $HCl$

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