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Standard XII
Chemistry
NCERT
Question

The diagram shows a tester consisting of a battery and LED whose open ends are dipped in a liquid. It is observed that even after some time, LED does not glow. Could it be due to the liquid being
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  1. Vinegar
  2. Molten salt
  3. Molten iron
  4. Pure cold water

A
Vinegar
B
Molten salt
C
Pure cold water
D
Molten iron
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Solution
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Since the LED does not glow, it is evident that there is no flow of a current in the tester. Except cold water all others are good conductors of electricity. Therefore, the liquid must be cold water which does not allow the current to pass through it.

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