2. Following are three beakers A, B and C filled with aqueous solutions of ethanol, KCl and acetic acid, respectively.
(a) Explain giving reasons, in which beaker will the bulb glow when the switch is on. Also compare the brightness of the glowing bulbs.
b) What change will occur if ethanol is replaced by NaOH solution?
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Answer:
(a) The bulb will glow brightest in KCl solution, less brighter in Acetic Acid solution and the least in Ethanol.
(b) The bulb will glow brighter if Ethanol is replaced by NaOH.
Explanation:
(a) KCl solution has more ions, ie. K+ cations and Cl- anions to conduct electricity. The number of electricity conducting ions reduce in Acetic Acid solution, and is the least in Ethanol.
(b) NaOH solution will have more ions, ie. Na+ cations and OH- anions to conduct electricity than the Ethanol solution. Therefore, the bulb in the NaOH solution will glow the brighter.
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