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Which of the following statement(s) is/are correct?

Options

  1. AColligative properties of 1 L of 1 M HCl solution decrease when equal volume of 1 M NaOH is mixed
  2. BVapour pressure of 3 molal aqueous solution of urea is less than that of 2 molal NaCl aqueous solution at the
  3. C0.2 M KCl ( aq ) (80 % . dissociation) is isotonic with 0.2 M CaCl ₂(40 % dissociation) at the same temperatur
  4. D0.1 ~m NaNO ₃ ( 90 % dissociation) has same boiling point as 0.1 ~m FeCl ₃ (30 % dissociation)

Correct answer

D. 0.1 ~m NaNO ₃ ( 90 % dissociation) has same boiling point as 0.1 ~m FeCl ₃ (30 % dissociation)

Step-by-step solution

Concentration if halved so, all the colligative properties of solution will decrease. Vapour pressure of 3 molal aq. solution of urea will be higher than that of 2 molal aq. NaCl solution because i =1 for urea and i =2 for NaCl aligned & KCl = K ⁺+ Cl ⁻ & 0.2(1-0.8) 0.16 0.16 & (ic =0.36 ) & CaCl ₂ Ca ²⁺+2 Cl ⁻ & (ic =0.36 ) aligned So, both these solutions are isotonic gathered NaNO ₃ 0.1(1-0.9) Na ⁺+ NO ₃⁻ NeCl ₃ gathered Ne ³⁺+3 Fl ⁻( ic =0.19) So both these solution have same boiling point.

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