Water as Universal Solvent

Q.

What color is Oxygen?

Q.

When a substance is dissolved in a solvent, the vapour pressure of solvent decreases. It means?

1. A decrease in boiling point of solution

2. An increase in boiling point of the solution

3. A decrease in freezing point of the solution

4. An increase in freezing point of the solution.

Q. One of most common solvent used for crystallization is

1. Sulphuric acid
2. Ethyl Alcohol
3. Water
4. Nitric acid

Q.

How is air dissolved in water different from ordinary air ?

Q.

Four- fifths by weight of air is nitrogen.

1. True
2. False

Q.

What are the components of air?

Q.

'Water is universal solvent' . Comment.

Q.

How will you determine the proportion of oxygen and nitrogen in air?

Q.

Name the solvent which is known as universal solvent.

1. Ethanol

2. Benzene

3. Vinegar

4. Water

Q.

What can water dissolve?

Q. Part of a soap that dissolves in water is known as:

1. Water resistant
2. Hydrophobic
3. Micelles
4. Hydrophilic

Q.

14 Gases are present in certain ratios in air. Can you tell the relative proportions of nitrogen and oxygen in air?

Q. is the common solvent used in the process of crystallization.

1. Sulphuric acid
2. Water
3. Nitric acid

Q.

61 Which of the following components of air is present in the largest amount in the atmosphere?

1. Nitrogen

2. Oxygen

3. Water Vapor

4. Carbon dioxide

Q. Which of the following substance is insoluble in water?

1. Sand
2. Salt
3. Glucose
4. Sugar

Q. Depending upon their boiling point different gases from air separated from _____________.

1. same heights
2. different heights
3. less heights
4. none of these

Q.

How would you obtain volatile acid from non-volatile acid?

Q. is the common solvent used in the process of crystallization.

1. Sulphuric acid
2. Water
3. Nitric acid

Q.

How to distinguish polar and non-polar solvents?

Q.

______ is known as universal solvent.

1. Oxygen
2. Nitrogen
3. Water
4. Carbon dioxide

Q. Ramlal adds alum to the water stored in his house. How does this help?
(a) Alum dissolves the impurities in water.
(b) Alum causes the impurities to stick to it and settle down.
(c) Alum makes the impurities lighter so that they can float on water and can then be removed easily.
(d) On adding alum, the impurities become harmless.

Q.

Which of the following can dissolve in water?
a) solids
b) liquids
c) gases

1. Solids

2. Liquids

3. Gases

4. All of the above

Q. Which of the following cannot be dissolved in water?

1. Common salt
2. Oxygen
3. Oil
4. Acetic acid

Q. The proportion of H and O atoms in the water molecule changes from sea water to tap water.

1. False
2. True

Q. ____ is known as an universal solvent.

1. Water
2. Oil
3. Milk
4. Petrol

Q.

Why are salts dissolved in water important?

1. They are essential for the growth and development of plants.

2. They supply essential minerals that our body needs.

3. They add taste to water.

4. All of the above

Q. Choose the correct pair for components of given solution.

1. Glucose
2. Water
3. Solute
4. Solvent
5. Glucose in water
6. Solution

Q. Properties of water molecule differ from that of hydrogen and oxygen atoms.

1. False
2. True

Q. One of most common solvent used for crystallization is

1. Ethyl Alcohol
2. Water
3. Sulphuric acid
4. Nitric acid