NCERT Class X Science Class: Chapter –2. Acids, Bases and Salts – Part-3

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Question 14:

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

5. (i) and (iii)

6. (ii) and (iii)

7. (i) and (iv)

8. (ii) and (iv)

Answer: D

Question 15:

The of the gastric juices released during digestion is

(a) Less than 7

(b) More than 7

(c) Equal to 7

(d) Equal to 0

Answer: A

Question 16:

Which of the following phenomena occur, when a small amount of acid is added to water?

1. Ionisation

2. Neutralisation

3. Dilution

4. Salt formation

5. (i) and (ii)

6. (i) and (iii)

7. (ii) and (iii)

8. (ii) and (iv)

Answer: B

Question 17:

Which one of the following can be used as an acid–base indicator by a visually impaired student?

1. Litmus

2. Turmeric

3. Vanilla essence

4. Petunia leaves

Answer: C

Question 18:

Which of the following substance will not give carbon dioxide on treatment with dilute acid?

1. Marble

2. Limestone

3. Baking soda

4. Lime

Answer: D

Question 19:

Which of the following is acidic in nature?

1. Lime juice

2. Human blood

3. Lime water

4. Antacid

Answer: A