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Solutions question

2009 · Q96
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Solutions question

2009 · Q96

NEETChemistrySolutionsMCQ+4 / −1
A 0.0020 m aqueous solution of an ionic compound [Co(NH3)5(NO2)]Cl freezes at −-− 0.00732oC. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (Kf = −-−1.86oC/m)
  1. A
    3
  2. B
    4
  3. C
    1
  4. D
    2
View written solutionFree

Correct answer: D

The number of moles of ions produced by 1 mol of ionic compound = i

Given, m = 0.0020 m

Δ\Delta ΔTf = 0oC – 0.00732oC = – 0.00732oC

Kf = – 1.86 oC

Δ\Delta ΔTf = ikfm

⇒\Rightarrow⇒ i = 0.007321.86×0.0020{{0.00732} \over {1.86 \times 0.0020}}1.86×0.00200.00732​ = 2

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