Question

how much work will be done in increasing the determine of a soap bubble from 2 c.m to 5 cm ? surface tension of soap solution is 3.0 × 10-2 N/m​

Answer 1

ANSWER:-

• We know that a bubble has two surfaces in contact with air, so the total surface area of the bubble will be
• =2×(4πR²)=8πR²
• Now, work done=Surface tension × Increase in surface area=
• 2.5x10^-2 ×(8πR²−0)= 5.652x10^-2J OR 0.056J

Answer 2

Answer:

This is because tap water contains chloride ions which will give a precipitate of AgCl with AgNO3 solution even if the organic compound does not contain chlorine