Surface tension of a soap bubble is 2.0 × 10–2 Nm–1 . Work done to increase the radius of soap bubble from 3.5cm to 7 cm will be: Take
9.24 × 10–4 J
5.76 × 10–4 J
0.72 × 10–4 J
18.48 × 10–4 J
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50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pKb of ammonia solution is 4.75, the pH of the mixture will be : Option: 1 3.75 Option: 2 4.75
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