Question

• Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the

presence of:

a. Acetic acid

b. Citric acid

c. Lactic acid

d. Oxalic acid

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

water?

i. Ionisation

ii. Neutralisation

iii. Dilution

iv. Salt formation

1. (i) and (ii)

2. (i) and (iii)

3. (ii) and (iii)

4. (ii) and (iv)

• Which of the following indicators turn red in an acidic solution?

i. Phenolphthalein

ii. Litmus

iii. Turmeric

iv. Methyl orange

Choose the correct option:

1(i) and (ii)

2(ii) and (iii)

3Only (ii)

4.(ii) and (iv)
• Bleaching powder is used as a disinfectant for water to:

a. Make water tastier

b. Remove all the dirt from water

c. Make water germ-free

• Dilute acid does not produce carbon dioxide on being treated with:

a. Marble

b. Lime

c. Baking soda

d. Limestone

• An ant’s sting can be treated with …………which will neutralise the effect of the

chemical injected by the ant’s sting into our skin.

Choose the correct option from the following to be filled in the blank space:

a. Methanoic acid

b. formic acid

c. Baking soda

d. Caustic soda

• Which one of the following salts will dissolve in water to form an alkaline solution?

a. Potassium carbonate

b. Sodium chloride

c. Sodium carbonate

d. Potassium sulphate

• Copper sulphate crystals when heated strongly, lose their water of crystallization to

give anhydrous copper sulphate accompanied by a change in color from:

a. Blue to green

b. Blue to white

c. Blue to sky blue

d. Blue to grey

• Tomato is a natural source of which acid?

(a) Acetic acid

(b) Citric acid

(c) Tartaric acid

(d) Oxalic acid
• Brine is an

(a) aqueous solution of sodium hydroxide

(b) aqueous solution of sodium carbonate

(c) aqueous solution of sodium chloride

(d) aqueous solution of sodium bicarbonate​

Answer 1

Answer:

Ans 1 : (b) citric acid

Ans 2 : (2) 1 and 3

Ans 3 : (4) 2 and 4

Ans 4 : (c) make water germ free

Ans 5 : (b) lime

Ans 6 : (c) Baking soda

Ans 7 : (c) sodium carbonate

Ans 8 : (b) blue to white

Ans 9 : (d) oxalic acid

Ans 10 : (c) aqueous solution of sodium chloride

Explanation: