| A student takes four test tubes marked P, Q, R and S of 25 mL capacity and fill 10 mL of distilled water in each. He dissolves one spoon full of four different salts in each as - KCl in P, NaCI in Q, CaCl; in R and MgCl; in S. He then adds about 2 mL of a sample of soap solution to each of the above test-tubes. On shaking the contents of each of the test-tubes, he is likely to observe a good amount of lather (foam) in the test tubes marked: |
| (a) P and Q |
| (b) R and S |
| (c) P, Q and R |
| (d) P, Q and S |
Answer:
(a) P and Q
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