Dilute and Concentrated Acids and Bases

Q.

The pH of lemon juice is

1. $4$

2. $10$

3. $7$

4. $2.2\text{to}2.4$

Q.

Which of the following statements is correct about an aqueous solution of an acid and of a base?

(i) Higher the pH, the stronger the acid

(ii) Higher the pH, weaker the acid

(iii) Lower the pH, stronger the base

(iv) Lower the pH, weaker the base.

1. (i) and (iii)

2. (ii) and (iii)

3. (i) and (iv)

4. (ii) and (iv)

Q.

Why is ${\mathrm{NH}}_4\mathrm{OH}$ a weak base when it has more concentration of ${\mathrm{H}}^{+}$ ions than ${\mathrm{OH}}^{-}$ ions?

Q. Which phenomena occurs when sodium hydroxide pellets are added to water?

1. Dissociation
2. Ionisation
3. Dilution
4. All of these

Q.

$NaOH$ is a strong base because:

1. It gives ${OH}^{-}$ ions.

2. It can be oxidised.

3. It can be easily ionised.

4. It can be reduced.

Q.

State the inference drawn from the following observations:
$pH$ of liquid $R$ is $10$. What kind of substance is $R$?

Q. The process of dissolving an acid or a base in water is a/an __________ reaction.

1. exothermic
2. oxidation
3. endothermic
4. reduction

Q. Highly concentrated acid solution can be prepared by adding ___ mL acid to 100 mL water.

1. 80
2. 50
3. 30
4. 10

Q.

Acetic acid (${\text{CH}}_3\text{COOH}$) is a weak acid because:

1. it is formed by reaction between a weak oxide and water.

2. it gets partially ionised in water.

3. it is produced slowly from vinegar.

4. it contains only four hydrogen atoms.

Q. Two test tubes containing water are labelled A and B. Few drops of hydrochloric acid are added to test tube A and acetic acid to test tube B. Which of the following statements are true regarding the number of $H^{+}$ ions in the test tubes?

1. Test tube A has more number of $H^{+}$ ions than test tube B
2. Test tube B has more number of $H^{+}$ ions than test tube A
3. Both the test tubes have equal number of $H^{+}$ ions
4. None of these

Q. The process of dissolving an acid or a base in water is a/an __________ reaction.

1. exothermic
2. endothermic
3. oxidation
4. reduction