Surface Tension

Q. What is \lbrack H+\rbrack in mol/L of a solution that is 0.20 M CH3COONa and 0.10 M in CH3COOH? (Ka for CH3COOH =1.8x10-5)

Q. A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic proces

Q.

What happens when surface tension decreases?

Q.

What are the forces responsible for the upward movement of water in the tracheary elements?

Q. If x molal solution of a compound in benzene has mole fraction of solute equal to 0.4.Then the value of x i

Q. 58. 22 g of solid co2 or dry ice is enclosed in a bottle of one litre properly closed if temperature of bottle is raised to 25^° c to sunlike all the Co2, the pressure in the bottle is A 13.23 b 12.23 c 11.23 d 14.23 a)11.04 cal/mol/k b)22.02 cal/mol/k c)15.24 cal/mol/k d)5.52 cal/mol/k

Q. is acetylene carboanion more stable than benzylic

Q.

When the vapor pressure of water is $30\mathrm{kPa}$ the temperature of the water is

1. $20°\mathrm{C}$

2. $100°\mathrm{C}$

3. $70°\mathrm{C}$

4. $40°\mathrm{C}$

Q. 24. The pOH at which water is maximum dissociated at 25 degree celsius 1. 14 2. 7 3. 0 4. none

Q.

What is the shape of the meniscus observed when water and mercury are taken in two different capillary tubes and why?

Q. Why does negative energy means attraction and positive repulsion in chemistry?

Q. Show the structure of 2-methoxypropane

Q. In fire polishing of glass why the glass is heated to make the sharp edges smooth? How by supplying energy the sharp edges are bcomin smooth?

Q. Exceptional properties of hydrogen

Q. When the temperature of a liquid increases, its surface tension
.

1. increases
2. decreases
3. remains constant

Q. 12. Will solubility increase or decrease on increasing pressure?

Q. Consider a binary mixture of two ideal volatile liquids A and B.
Which of the following represents the correct relation?

(Here total pressure of the solution is $\left(P_T\right)$, mole fraction of component A in vapour phase is $y_A$, vapour pressure of component A and B in pure states is $p_A^{\circ }and{p}_B^{\circ }$ respectively.)

1. $P_T=\frac{p_A^{\circ }\times p_B^{\circ }}{p_A^{\circ }+(p_B^{\circ }-p_A^{\circ })\times y_A}$
2. $P_T=\frac{p_A^{\circ }+p_B^{\circ }}{p_A^{\circ }+(p_B^{\circ }-p_A^{\circ })\times y_A}$
3. $P_T=\frac{p_A^{\circ }-p_B^{\circ }}{p_A^{\circ }+(p_B^{\circ }+p_A^{\circ })\times y_A}$
4. $P_T=\frac{p_A^{\circ }\times p_B^{\circ }}{p_A^{\circ }+(p_B^{\circ }+p_A^{\circ })\times y_A}$

Q.

The phenomenon responsible for spherical shape of liquid drops is:

1. Diffraction

2. Viscosity

3. Interference

4. Surface tension

Q. Due to surface tension, rain drops have tendency to acquire shape.

1. spherical
2. cylindrical
3. conic
4. cubic

Q.

Water shows capillary action in a narrow glass tube. Give appropriate reasons.

Q. There is a depression in the surface of the liquid in a capillary when

1. The cohesive force is smaller than the adhesive force.
2. The cohesive force is greater than the adhesive force.
3. The cohesive and adhesive forces are equal.
4. None of the above is true.

Q. An underwater bubble with radius 0.5cm at the bottom of the tank, where the temperature is 5 c and pressure is 3 atm rises to the surface where the temperature is 25 c. the vapor pressure and the pressure is 1 atm. What will be the radius of the bubble when it reaches the surface?

Q. 10. No. Of molecukes in 18 ml of water.?

Q. A gaseous mixture contains nitrogen and oxygen in the ratio of4 :1 by weight. Therefore, the ratio of their number ofmolecules is:

Q. Which of following correctly represents the relation between capillary rise h and capillary radius r?

1. 
2. 
3. 
4.