Question

Riya was performing few laboratory experiments. Follow the steps and choose the option which correctly interprets it. Step I- Take three test tubes A,B,C Step II- Take water in test tube A, sulphuric acid in B and copper sulphate in C Step III- Add zinc granules in each test tube Step IV- Heat to be provided wherever required Step V- Bring burning matchstick near the mouth of each test tube

(2

pop sound heard in A,B,C

pop sound heard in B & C

pop sound heard in A & B

pop sound heard in A & C​

Answer 1

Answer:

While performing both experiments, foam will be formed.

In Set I we will have more length of foam because it consist of soft water. It's because,

In Set II we will have less foam because it consist of hard water due to the presence of CaSO4. The addition of Calcium salt makes the distilled water hard and leads to the formation of scum. Soaps don't react efficiently in hard water.....

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Explanation:

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