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NEET2026ChemistryChapterActual

The dissociation of phosphorus pentachloride is an endothermic process: PCl ₅( g ) PCl ₃( g ) + Cl ₂( g ), H > 0 According to Le Chatelier's principle, which of the following conditions will favor the maximum yield of products?

Options

  1. AHigh pressure, low temperature, and addition of Cl ₂ gas
  2. BLow pressure, high temperature, and continuous removal of PCl ₃
  3. CHigh pressure, high temperature, and use of a suitable catalyst
  4. DLow pressure, low temperature, and increasing the concentration of Cl ₂

Correct answer

B. Low pressure, high temperature, and continuous removal of PCl ₃

Step-by-step solution

The given reaction is PCl ₅( g ) PCl ₃( g ) + Cl ₂( g ) with H > 0 . According to Le Chatelier's principle: Since the reaction is endothermic ( H > 0 ), an increase in temperature will shift the equilibrium in the forward direction to absorb the added heat. Thus, high temperature favors the formation of products. The number of gaseous moles increases from 1 on the reactant side to 2 on the product side. A decrease in pressure shifts the equilibrium in the direction of a greater number of gaseous moles. Thus, low pr

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