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Physical Chemistry -- Liquid State
16.
For which of the following pairs is the angle of contact the maximum?
- A.Water with glass
- B.Water with paraffin
- C.Methylene iodide with glass
- D.Mercury with glass
- Answer
- Report
Answer : [D]
17.
A 5 cm–long needle is floating on water. What can be the maximum mass
of the needle (surface tension of water = 0.075 N m -1, g = 10 m s -2)?
- A.0.75 g
- B.1.25 g
- C.0.50 g
- D.1.00 g
- Answer
- Report
Answer : [A]
18.
When dipped in a liquid vertically, a capillary tube records a rise of 5 cm.
When the tube is held in the liquid inclined at an angle of 45o to the
vertical, the approximate length of the tube up to which the liquid rises is
- A.9.0 cm
- B.8.0 cm
- C.7.0 cm
- D.10.0 cm
- Answer
- Report
Answer : [C]
19.
The surface tension of a soap solution is 30 x 10 -3 N m -1. The work done
in stretching a bubble of this solution of surface area 5 cm x 5 cm, to an area of 10 cm x 10 cm, is
- A.4.5 x 10 -4 J
- B.6.0 x 10 -4 J
- C.4.5 x 10 -5 J
- D.7.5 x 10 -4 J
- Answer
- Report
Answer : [A]
20.
Calculate the force exerted by water by across a line of length 10 cm
drawn along the surface (surface tension of water = 0.075 N m -1).
- A.7.5 x 10-3 N
- B.7.5 x 10-4 N
- C.7.5 x 10-2 N
- D.7.5 x 10-3 N
- Answer
- Report
Answer : [D]
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