Acids, Bases and Salts Worksheet-5

Acids, Bases and Salts Worksheet-5

1. A certain solution, when added dropwise to phenolphthalein solution, gives a pink colour. What do you infer about its pH?

(A) pH > 7

(B) pH = 7

(C) pH > 7

(D) None of these

2. How do you think a soil should be treated, to which excessive chemical fertilizers have been added?

(A) Such a soil can be treated by adding base

(B) Such a soil can be treated by adding CaO

(C) Such a soil can be treated by adding Ca(OH)₂

(D) All of these

3. A colourless liquid turns blue litmus red and reacts with magnesium to produce a gas. What type of substance must the colourless liquid be?

(A) Acidic

(B) Basic

(C) Neutral

(D) Both (B) & (C)

4. Alkalies are

(A) Bases which are insoluble in water

(B) Acids which are soluble in water

(C) Bases which are soluble in water

(D) Acids which are insoluble in water.

5. Study the table carefully.

Which of the above are correctly matched?

(A) (i) & (iii)

(B) (ii) & (iv)

(C) (i), (ii) & (iii)

(D) (i), (iii) & (iv)

Answer Key:

1. (C)
2. (D)
3. (A)
4. (C)
5. (A)