Acids and Bases in Water

Q.

What happens to the solubility of a saturated solution of NaCl, when a current of HCl gas is passed through it?

1. Increases

2. Remains unchanged

3. Decomposes NaCl

4. Decreases

Q. What are the respective pH values of water, sulphuric acid and ammonium hydroxide?

1. 7, less than 7, more than 7
2. Less than 7, 7 and more than 7.
3. Less than 7, less than 7 and 7.
4. More than 7, more than 7 and less than 7

Q. For dilution of concentrated acid, we should add

1. water into concentrated acid.
2. concentrated acid into water.
3. first water into acid and then more acid.
4. Both (a) and (b) are correct.

Q.

In water, oxygen has a slight negative charge and hydrogen has a slight positive charge. So what type of bond does water have?

1. Covalent bond

2. Ionic bond

3. Non polar covalent bond

4. Polar covalent bond

Q.

Which of the following salts when dissolved in water will get hydrolysed to form an acidic solution?

1. $CaC{l}_2$

2. $NaCl$

3. ${NH}_{4}Cl$

4. $KCl$

Q. Copper oxide is a/an while potassium hydroxide is a/an .

1. base
2. alkali
3. acid
4. salt

Q.

Choose the correct option:

1. Positively charged ions are anions and negatively charged ions are cations.

2. Positively charged ions are cations and negatively charged ions are anions.

3. Both the ions are called cations.

4. Both the ions are called anions.

Q.

An aqueous solution with pH = 0 is

1. Acidic

2. Neutral

3. Alkaline

4. Amphoteric

Q. An aqueous solution of an acid conducts electricity.

1. True
2. False

Q. What can we say about an aqueous solution which has a pOH =5?

1. Amphoteric
2. Acidic
3. Neutral
4. Basic