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Q.

Conductivity of a saturated solution of Co2[Fe(CN)6] is and that of water used is 2×106Ω1cm1. The molar ionic conductivities of Co2+and [Fe(CN)6]4 are 106Ω1cm2mol1and 444Ω1cm2mol1respectively. The correct statement(s) among the following is (are)

 

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a

Limiting molar conductivity of Co2[Fe(CN)6] is 550  Ω1cm2mol1

b

Solubility product of Co2[Fe(CN)6] is 6.25×1017M3

c

Solubility of Co2[Fe(CN)6] in water at 298 K is 2.5×109M

d

Addition of few drops of 0.01 M solution of K4[Fe(CN)6] increases the conductivity of the solution.

answer is C, D.

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Detailed Solution

(D) Addition of K4[Fe(CN)6] causes some precipitation but 2 Co2+ ions in the solution will be replaced by 4 K+ ions which would increase the conductivity.

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