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Q.

The resistance of a solution is 200Ω when placed in a conductivity cell of cell constant 0.4cm1 If the molar conductivity of the solution is 20Scm2mol1, the concentration of the solution will be

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a

0.01 M

b

0.1 M

c

103M

d

104M

answer is B.

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Detailed Solution

κ=Kcell R=0.4cm1200Ω=2×103Scm1

c=κΛm=2×103Scm120.0Scm2mol1=1.0×104molcm3=1.0×104mol101dm3=0.1moldm3

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The resistance of a solution is 200Ω when placed in a conductivity cell of cell constant 0.4cm−1.  If the molar conductivity of the solution is 20Scm2mol−1, the concentration of the solution will be