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NEET 2009
Exam
NEET
Year
2009
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2009 · Chemistry · Chemical Kinetics

A 0.0020 M aqueous solution of an ionic compound Co(NH_3)_5(NO_2)...

A 0.0020M0.0020 \mathrm{M} aqueous solution of an ionic compound Co(NH3)5(NO2)Cl\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{NO}_2\right) \mathrm{Cl} freezes at −0.00732∘C-0.00732^{\circ} \mathrm{C}. Number of moles of ions which 1 mole of ionic compound produces on being dissolved in water will be : (kf=1.86∘C/m)\left(\mathrm{k}_{\mathrm{f}}=1.86^{\circ} \mathrm{C} / \mathrm{m}\right) -

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

B. 2

Step-by-step solution

ΔTf=ikf⋅m\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{ik}_{\mathrm{f}} \cdot \mathrm{m}i=ΔTfkf⋅m=0.007321.86×0.002=0.007320.00372i=2\begin{aligned}\mathrm{i}& =\frac{\Delta \mathrm{T}_{\mathrm{f}}}{\mathrm{k}_{\mathrm{f}} \cdot \mathrm{m}}\\ & =\frac{0.00732}{1.86 \times 0.002}=\frac{0.00732}{0.00372}\\ \mathrm{i}& =2 \end{aligned}Compoundwillbe[Co(NH3)5]NO5NO2]ClCompound will be \left.\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\right] \mathrm{NO}_5 \mathrm{NO}_2\right] \mathrm{Cl} Total possible ions =2=2
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