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Standard VIII
Physics
Electrolytic Cell
Question

Three different electrolytic cells A, B, and C are connected in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of these observations.

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Solution
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I. Sodium chloride solution (NaCl) is a strong electrolyte. It dissociates almost completely when dissolved in water to give free mobile ions. Hence, NaCl conducts electricity in large quantity.
II. Acetic acid is a weak electrolyte so it conducts electricity in small quantity.
III. Sugar is a non-electrolyte. It has only molecules and no ions. Hence, it does not allow current to pass through.

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Q1
Three different electrolytic cells A, B, and C are connected in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of these observations.
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Q2
Assertion :A, B & C are three electrolytic cells, connected in different circuits. Cell 'A' contains NaCl solution, and the bulb in the circuit glows brightly when the circuit is completed. Cell 'B' contains acetic acid and the bulb glows dimly. Cell 'C' contains sugar solution, & the bulb does not glow. Reason: NaCl is strong electrolyte so it dissociates completely into ions. Acetic acid is weak electrolyte so it dissociates very less. Sugar is non-electrolyte so it doesn't dissociates into ions.
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Q3

(a) Select the correct answer.

A compound which during electrolysis in its molten state, liberates a reddish brown gas at the anode.

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