Question

a student takes about 5 ml distilled water in 4 test tubes marked p, q, r and s. he dissolves nacl in p, kcl in q, cacl2 in r and mgcl2 in s. after that he adds equal amount of soap solution in each test tube. on shaking these test tubes he would observe a good amount of lather in the test tubes marked -

1. p and q

2. q and r

3. r and s

4. p and s

Answer 1

the student will get a good amount of lather in p and q. test tube.... so option is 1

Answer 2

your answer is 1 option