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Select and write the most appropriate answer from the given alternative for each sub-question : A rectangular film of a liquid is 5 cm long and 4 cm wide. If the work done in increasing its ara to `7 cm xx 5 cm` is 0.06 J, the surface tension of the solution is :A. `0.02 J//m^(2)`B. `0.2 J//m^(2)`C. `2 J//m^(2)`D. `20 J//m^(2)`

Answer» Correct Answer - D


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