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Question

# The molar conductivity of 0.04 M solution of MgCl2 is 200 Scm2mol−1 at 298 K. A cell with electrodes that are 2.0 cm2 in surface area and 0.50 cm apart is filled with MgCl2 solution. Specific conductance of MgCl2 solution is: [1 Mark]

A
8×103 Scm1
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B
5×103 Scm1
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C
0.03 Scm1
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D
0.08 Scm1
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Solution

## The correct option is A 8×10−3 Scm−1Given, The concentration of the solution (C)=0.04 M Molar conductance (Λm)=200 Scm2mol−1 ∴Specific conductance (κ)=Λm×C1000 ⇒κ=200×0.041000 =8×10−3Scm−1

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