Question

Please solve and show accurate answers!

1) Which of the following statements about osmosis and reverse osmosis are correct?

a) Osmotic pressure occurs when you mix water and oil

b) Reverse osmosis produces pure solutions.

c) Osmosis occurs because solutions have higher total energy than solvents.

d) Osmosis doesn’t occur in biological systems

e) Reverse osmosis produces energy

2) Which of the following is a colligative property?

a) Hydrogen bonding

b) Boiling point depression

c) Super saturation

d) Freezing point depression

e) Freezing point elevation

3) Which of the following definitions is correct?

a) Solubility - Minimum amount of solute which will dissolve.

b) Precipitation - A reaction which produces a new soluble product.

c) Saturated Solution – A solution has the maximum amount of dissolved solute

d) Immiscible – two liquids which will dissolve in each other

e) Miscible – two liquids that will not dissolve in each other

4) Consider the energy involved in making a solution:

ΔHsolution   =   ΔHsolute   +   ΔHsolvent   +   ΔHmix

Which of the following statement(s) is correct?

a) ΔHsolute is always negative

b) ΔHmix is always positive

c) ΔHsolvent is always negative

d) All answers are correct.

e) Generally, if ΔHsolution is negative then the solute is soluble

5) Assuming that it completely dissociates in solution, what is the Van’t Hoff factor for Na3PO4?

a)1

b)4

c) 0

d) 2

e) 3

Answer 1

Ans 1 : b) Reverse osmosis produces pure solutions.

Usually the solvent moves from the dilute solution to a higher concentrated solution through a semi permeable membrane , by a process called as osmosis. But is pressure more than the osmotic pressure is applied to the high concentrated solution side,the solvent moves out of the concentrated solution into the dilute one. This technology is helpful to make solutions pure , an application used in the purification of water.