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Question

Which of the following solutions will not make the bulb glow ?

A
Sodium chloride
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B
Copper sulphate
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C
Silver nitrate
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D
Sugar solution in diluted water
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Solution

The correct option is D Sugar solution in diluted water
Ions are needed to conduct electricity. Sodium chloride, copper sulphate and silver nitrate give out ions in the solution. So, they conduct electricity.
Sugar solution in diluted water does not make ions and is a poor conductor of electricity. Therefore, it will not make the current flow through it and hence, the bulb will not glow.

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