Chapter No 6
Table of content:
|Name of topic
Given the Answer of the following Question.
Q.No.26. Which one of following solution is more concentrated one molar solution or 3 molar? Why?
Ans. 3 molar solution is more concentrated because it has dissolved large amount of solute.
Q.No.27. How much volume of 0.1 M solution is requried if you are asked to prepera a solution of 0.1 molar having volume 100cm3?
Ans. M1 = 0.1
M2 = 0.01
V2 = 100cm3
M1V1 = M2V2
V1 = M2V2/M1
V1 = 0.01 x 100 / 0.1 = 10cm3
Q.No.28. Define the term dilute solution?
Ans. A type of solution in which the dissolved amount of solute is low is know as dilute solution.
Q.No.29. How can you prepare 1dm3 solution of NaOH having 0.5M molarity?
Ans. Molar mass of NaOH = 40
Mass of solute = Molarity x molar mass of solute x volume of solution
= 0.5 x 40 x 1
20 gram of NaOH is dissolved in sufficient solution that its volume because 1dm3.
Q.No.30. 5cm3 acetone is dissolved to prepare 90cm3 aqueous solution. Calculate the percentage v/v of the solution?
Ans. Concentration of solution v/v = volume of soulte / volume of solution x 100
= 5/90 x 100 = 5.5
Q.No.31. Define solubility?
Ans. Solution is defined as number of grams of solute dissovled in 100 garm of solvent to prepare saturated solution at particular temperature.
Q.No.32. Why test tube becomes cold when KNO3 is dissolved in water?
Ans. When KNO3 is dissolved in water an endothermic process has been taking place that’s why test tube because cold.
Q.No.33. What is general principle of solubility?
Ans. The common rule of solubility is “like dissolve like” polar compounds are dissovled in polar solvents. Non-polar compounds do not dissolved in polar solvents. Non polar covalent compound dissolved in non polar solvents.
Q.No.34. What is the effect of temperature on solubility?
Ans. Temperature has greater effect on solubility usually by increasing temperature solubility is also increased.
When a solubility is made by adding some salt in a solvent there will be three condition.
i. Heat is absorbed
ii. Heat is released
iii. There is no change in heat.
Q.No.35. Justify with example that solubility of a salt increase with increase in temperature?
Ans. If during salt dissolving process heat is absorbed then the solubility of such salts increase with increase of temperature. e.g. when KNO3 is dissolved in water an endothermic process takes place hence tube become cold.
Q.No.36. What is difference between true solution and colloidal solution?
Ans. True solution:
The particles of true solution are very small that they can’t scatter the rays of light.
The particles of colloidal are big enough that scatter the rays of light when light passes through them.
Q.No.37. What is tyndall effect?
Ans. When light is passed through colloidal the particles of colloid scatter the light rays. This phenomenon is called tyndall effect. It depends upon size of particles.
Q.No.38. How can justify that milk is a colloid?
Ans. Milk is colloid because its particles pass through filter paper. It’s particles scatter the light rays and show tyndall effect.
Q.No.39. Define suspension with an example?
Ans. Heterogeneous mixture of undissolved particles of solute in a medium called suspension. The particles of suspension are big enough to be seen with naked eye. e.g chalk solution and paint.
Q.No.40. Write two properties of suspension?
Ans. The particles of solute in a suspension are big enough to be seen with naked eye. In suspension the solute particles cannot pass through filter paper.
Q.No.41. On what factors tyndall effect depends?
Ans. It depends upon the wavelength of light and size of solute particles.
Q.No.42. Write down any four example of colloidal solution?
Ans. Milk, Ink, Jelly, Toothpaste are the example of colloidal solution.
Q.No.43. Why do true solution not show tyndall effect?
Ans. True solution do not show the phenomenon of tyndall effect because the particles of true solution can not scatter the light rays when light passes through them.
Q.No.44. Why does not the suspension form Homogeneous mixture?
Ans. The particles of suspension are big enough to be seen with naked eye. They don’t dissolved in solvent and easily settled down that is why suspension do not form Homogeneous mixture.
Q.No.45. Why we stir paint thoroughly before using?
Ans. Paint are suspension their heave particles are settled down that is why paint are stirrer before use.
Q.No.46. How will you test whether given solution is a colloidal solution or not?
Ans. Through the phenomenon of tyndall effect it has to be decided that either given solution is colloid or not.
Q.No.47. Why does the colloid show tyndall effect?
Ans. The particles of colloids are big but enough to be seen with naked eye. When light passes through them they scatter the light rays. This phenomenon of scattering is known as tyndall effect.
Q.No.48. Give two examples of colloid?
Ans. Blood, Jelly, And tooth paste are examples of colloid.
Q.No.49. Defin colloid?
Ans. Colloid are the solutions in which particles are large than the particles of solute of real solution but not big enough to be seen with naked eye.
Q.No.50. How colloid differ from solution?
Ans. The components of solution are very small that they do not scatter light when light passes through them. While the particles of colloid are big enough to scatter the when light is passing through them.
Q.No.51. Why are the colloid quite stable?
Ans. In colloid particles are dissolved but do not settled down for a long time. That is why colloid are quite stable.
Q.No.52. Write down any two difference between solution and suspension?
1. A homogeneous mixture of two or more components.
2. The particles of solution can not be seen with naked eye.
1. The heterogeneous mixture of undissolved particles.
2. The particles are big enough to be seen with naked eye.
Q.No.53. Identify as colloid or suspension from the following. Chalk, Soap Solution, Milk, paints.
Ans. Suspension= paint and chalk
Colloid = milk and soap solution
Q.No.54. Differentiate between colloid and suspension.
1. The particles of colloid show tyndall effect.
2. The particles of colloid can pass through filter paper.
3. It’s particles do not settled down for a long time.
1. The particles of suspension do not show tyndall effect.
2. Its particles do not pass through filter paper.
3. It particles settled down after some time.