Solubility

Q.

Substance that does not dissolve in a solution is termed as:

1. soluble

2. insoluble

3. saturated

4. supersaturated

Q.

Assertion: When a saturated solution of Potassium chloride is heated it becomes unsaturated

Reason:​ Solubility of Potassium chloride increases with rising temperature.

1. If ‘A’ and ‘R’ are true and ‘R’ is the correct reason for ‘A’.

2. If ‘A’ and ‘R’ are true and ‘R’ is not the correct reason for ‘A’.

3. If ‘A’ is correct and ‘R’ is wrong.

4. If ‘A’ is wrong and ‘R’ is correct.

Q. Which of these factors affect the solubility of solids in water?

1. Size of solute particles
2. Stirring
3. Pressure
4. Temperature

Q.

The liquid in which solute dissolves is called the _____

Q.

The ability of a substance to be dissolved in a solvent, at a given temperature, is known as __________.

1. mixing

2. solubility

3. saturation

4. adsorption

Q.

Sugar dissolves faster on stirring with a spoon. Which of the following is the best reason to explain this?

1. Mechanical stirring decreases solubility.

2. Mechanical stirring increases solubility.

3. Stirring has nothing to do with solubility.

4. The solution becomes unsaturated if it is stirred.

Q.

Which factor would not affect the solubility of sugar in water?

1. Heating the water and sugar

2. Adding salt to the water

3. Grinding the sugar to make it finer

4. Stirring the water and sugar

Q.

The solubility of a solute is 35 at ${60}^{o}C$ and 25 to ${30}^{o}C$. If 200 g of solvent is made to saturate with the solute at ${60}^{o}C$, what is the amount of precipitate formed at ${30}^{o}C$?

Q.

What is a seminormal and decinormal solution?

Q. Heating of saturated solution increases the solubility of the solute in the solution.

1. True
2. False

Q.

Why is temperature always mentioned with a saturated solution?

Q.

Sheela, Saima and Ravi have to dissolve the maximum amount of sugar in the same amount of milk so as to win a game. Ravi took hot boiling milk while Saima took ice-cold milk. Sheela managed to get milk at room temperature. Whom do you think would win the game and why?

Q.

What happens when a crystal of solute is introduced into a saturated solution of the solute

Q.

How would you prepare a saturated solution of sodium chloride in water at ${30}^{\mathrm{o}}\mathrm{C}$. What will happen if this solution is cooled at ${10}^{\mathrm{o}}\mathrm{C}$?

Q.

Question 27
Match the substances in Column A with their applications given in Column B.

Column A (Substances)	Column B (Applications)
(a) Oxygen	(i) For making crackers
(b) Copper	(ii) For disinfecting water
(c) Sulfur	(iii) all living beings inhale during breathing
(d) iron	(iv) for making electric wires
(e) Chlorine	(v) for making rails

Q.

The solubility of potassium chloride (KCl) and Hydrogen chloride (HCl) for different temperatures is given in the table below:

Temperature (degree celsius)	10	20	30	40	50	80
Solubility (g per 100 ml), KCl	31.2	34.2	37.2	40.1	42.6	51.5
Solubility (g per 100 ml), HCl	75	70	65.5	61	57.5	51.5

At what temperature, both substances have the same solubility
?

1. ${10}^{\circ }C$

2. ${30}^{\circ }C$

3. ${50}^{\circ }C$

4. ${80}^{\circ }C$

Q.

What happens to the solubility of most of the solids due to a rise in the temperature?

1. decreases

2. increases

3. remains the same

4. can't say

Q.

The concentration of a solution is directly related to

1. Solubility

2. Temperature

3. Pressure

4. All of the above

Q.

Two gases found dissolved in natural water are

(a) oxygen and carbon dioxide

(b) hydrogen and oxygen

(c) sulphur dioxide and hydrogen

(d) chlorine and ammonia

Q.

How can you prepare a saturated solution of sugar?

Q.

Difference between saturated and supersaturated solution.

Q.

7. Which physical properties help to distinguish the following

A} Common salt from sugar

Q. One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

Q.

Observe the graph carefully.

More amount of potassium chlorate can be added than potassium chloride above ${80}^{\circ }C$ in 500 ml of water.

1. True

2. False

Q.

What would you observe when:

a saturated solution of potassium nitrate prepared at ${60}^{\mathrm{o}}\mathrm{c}$ is allowed to cool to room temperature.

Q. The solubility of ammonia in water is 52.9 whereas solubility of $N_2$ is only 0.0019. Reason for this is

1. $N_2$ is heavier than $N{H}_3$
2. $N{H}_3$ reacts with water forming $N{H}_{4}OH$
3. Water reacts with $N_2$ forming $N_{2}O$

Q.

A saturated solution of sugar at room temperature can dissolve more sugar at a higher temperature.

1. True
2. False

Q.

How can you change a saturated solution to an unsaturated solution without adding any more solvent to it?

Q.

The solubility increases for every solute with the increase in temperature.

1. True

2. False

Q.

Which is the correct explanation of a saturated solution?

1. A solution that cannot dissolve any more solute.

2. A solution that cannot dissolve any more solute at a given temperature.

3. A solution that cannot dissolve any more solute at room temperature.

4. A solution that can dissolve any amount of solute at a given temperature.