An electrolytic cell is taken with two graphite rods inserted in it and connected to opposite terminals of a battery. An electric bulb is also introduced on the circuit. Different substances are taken in the cell and the conductivity is tested. Identify the case where the bulb glows most brilliantly.
Kerosene oil
Molten lead bromide
Molten wax
Barium sulphate in water
A
Molten wax
B
Kerosene oil
C
Barium sulphate in water
D
Molten lead bromide
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Solution
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Molten lead broimide is the best conductor among molten wax, kerosene oil and barium sulphate in water. Molten salts are fully ionized and diluted salts contain some unionized molecules also.
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