Question

5. Classify the following liquids into electrolyte and non-electrolyte: lemon juice, vegetable
oil, distilled water, lap water, milk, isopropyl alcohol, diesel.​

Answer 1

Answer:

We found that metals such as copper and aluminium conduct electricity whereas materials such as rubber, plastic and wood do not conduct electricity. However, so far we have used our tester to test materials which were in solid state. But what about liquids?

Do liquids also conduct electricity? Let us find out.

Paheli and Boojho want to remind you that one should not experiment with the electric supply from the mains or a generator or an inverter. Use only electric cells for all the activities suggested here.

14.1 Do Liquids Conduct Electricity?

To test whether a liquid allows electric current to pass through it or not, we can use the same tester (Fig. 1) which we made in Class VI. However, replace the cell by a battery. Also, before using the tester we should check whether it is working or not.

Answer 2

Electrolyte:

1. Lemon juice

2. tap-water

3. milk

4. diesel

non-electrolyte:

1. vegetable oil

2. distilled water

3. isopropyl alcohol

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