A student took four test tubes P, Q, R and S and filled about 8 ml. of distilled water in each after that he dissolved an equal amount of \[\mathbf{N}{{\mathbf{a}}_{\mathbf{2}}}\mathbf{S}{{\mathbf{O}}_{\mathbf{4}}}\] in P, \[{{\mathbf{K}}_{\mathbf{2}}}\mathbf{S}{{\mathbf{O}}_{\mathbf{4}}}\] in Q, \[\mathbf{CaS}{{\mathbf{O}}_{\mathbf{4}}}\] in R and \[\mathbf{MgS}{{\mathbf{O}}_{\mathbf{4}}}\]in. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes: |
(a) P and Q |
(b) P and R |
(c) P, Q and S |
(d) Q, R and S |
Answer:
(a) P and Q
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