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AP EAMCET2010ChemistrySolutions

X is a non-volatile solute and Y is a volatile solvent. The following vapour pressures are observed by dissolving X in Y . The correct order of vapour pressures is

Options

  1. Ap₁ < p₂ < p₃
  2. Bp₃ < p₂ < p₁
  3. Cp₃ < p₁ < p₂
  4. Dp₂ < p₁ < p₃

Correct answer

D. p₂ < p₁ < p₃

Step-by-step solution

When a non-volatile solute is added to a volatile solvent, the solute covers up some of the surface of solvent. Thus, less surface area is available for vaporisation of solvent and hence, vapour pressure decreases. As the amount of non-volatile solute increases, vapour pressure decreases accordingly. The order of concentration of X is 0.01 p₁>p₂

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