The values of conductivity of some materials at 298 .15 K in Sm − 1 are 2 .1 × 10 3 , 1 .0 × 10 − 16 , 1 .2 × 10 , 3 .91 , 1 .5 × 10 − 2 , 1 × 10 − 7 , 1 .0 × 10 3 . The number of conductors among the materials is _____.

Step-by-step solution

Molar conductivity is the conductance property of a solution containing one mole of the electrolyte, or it is a function of the ionic strength of a solution or the concentration of salt. Λ m = K / C Where K is the specific conductivity and C is the concentration in mole per litre. Conductivity Sm − 1 2 .1 × 10 3 1 .2 × 10 3 .91 1 × 10 3 conductors at 298 .15 K 1 × 10 − 16 Insulator at 298 .15 K 1 .5 × 10 − 2 1 × 10 − 7 Semiconductor at 298 .15 K Therefore number of conductors is 4 .