Question:medium

One mole of P4 reacts with 8 moles of SOCI2 to give 4 moles of A. x mole of SO2 and 2 moles of B. A, B and x respectively are

Updated On: Feb 26, 2026
  • POCl3, S2Cl2 and 4
  • PCl3, S2Cl2 and 2
  • PCi3, S2Cl2 and 4
  • POCl3, S2Cl2 and 2
Show Solution

The Correct Option is C

Solution and Explanation

To determine the products A, B, and the value of x when one mole of P4 reacts with 8 moles of SOCl2, we can analyze the balanced chemical reaction.

The given reaction can be represented as follows: 

P4 + 8 SOCl2 → 4 PCl3 + 2 S2Cl2 + x SO2

Now let's balance it step-by-step:

  • We know that phosphorus (P4) combines with thionyl chloride (SOCl2).
  • Each molecule of P4 should ideally produce phosphorus trichloride (PCl3), sulfur dichloride (S2Cl2), and sulfur dioxide (SO2).
  • The stoichiometry of the reaction is such that one mole of P4 produces four moles of phosphorus trichloride (A = PCl3), two moles of disulfur dichloride (B = S2Cl2), and x = 4 moles of sulfur dioxide (SO2).

Thus, the products are:

ProductNumber of moles
A = PCl34 moles
B = S2Cl22 moles
x = SO24 moles

Therefore, the correct option is PCl3, S2Cl2, and 4.

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