Quiz Time : Acids, Bases and Salts

Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? *

1 point

Yellowish green

Blue

Red

Yellow

Which of the following gives the correct increasing order of acid strength? *

1 point

Water < acetic acid < hydrochloric acid

Water < hydrochloric acid < acetic acid

Hydrochloric acid < water < acetic acid

Acetic acid < water < hydrochloric acid

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

1 point

Lime

Limestone

Marble

Baking soda

Which of the following statement is true for acids? *

1 point

Sour and change blue litmus to red

Sour and change red litmus to blue

Bitter and change blue litmus to red

Bitter and change red litmus to blue

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done? *

1 point

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

Wash the hand with saline solution

After washing with plenty of water applies solution of sodium hydroxide on the hand

Neutralise the acid with a strong alkali

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved? (i) It turns lime water milky. (ii) It extinguishes a burning splinter. (iii) It dissolves in a solution of sodium hydroxide. (iv) It has a pungent odour. *

1 point

(i), (ii) and (iii)

(i) and (iv)

(i) and (ii)

(ii), (iii) and (iv)

To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is *

1 point

Basic

Acidic

Neutral

Corrosive

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change? *

1 point

Hydrochloric acid

Baking powder

Lime

Ammonium hydroxide solution

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

1 point

(ii) and (iii)

(iv) Formation

(i) Ionisation

(iii) Dilution

(ii) and (iv)

(ii) Neutralisation

(i) and (iii)

(i) and (ii)

Sodium carbonate is a basic salt because it is a salt of *

1 point

Strong acid and strong base

Strong acid and weak base

Weak acid and weak base

Weak acid and strong base

Which of the following salts does not contain water of crystallisation? *

1 point

Washing soda

Blue vitriol

Gypsum

Baking soda

Which of the following is/are true when HCl(g) is passed through water? (i) It does not ionise in the solution as it is a covalent compound. (ii) It ionises in the solution. (iii) It gives both hydrogen and hydroxyl ion in the solution. (iv) It forms hydronium ion in the solution due to the combination o hydrogen ion with water molecule. *

1 point

Only (i)

Only (iii)

(ii) and (iv)

(iii) and (iv)

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

1 point

Vanilla essence

Petunia leaves

Litmus

Turmeric

Calcium phosphate is present in tooth enamel. Its nature is *

1 point

Amphoteric

Basic

Neutral

Acidic

The pH of the gastric juices released during digestion is *

1 point

More than 7

Equal to 7

Less than 7

Equal to 0

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue? *

1 point

(b) Vinegar

(c) Common salt

Lemon juice

(d) An antacid

During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to *

1 point

(a) Absorb the evolved gas

(b) Moisten the gas

(c) Absorb moisture from the gas

( d) Absorb Cl- ions from the evolved gas

Which of the following statements is correct about an aqueous solution of an acid and a base? (i) Higher the pH, 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 point

(i) and (iii)

(ii) and (iv)

(i) and (iv)

(ii) and (iii)

What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) The temperature of the solution increases. (ii) The temperature of the solution decreases. (iii) The temperature of the solution remains the same. (iv) Salt formation takes place. *

1 point

Only (i)

(i) and (iii)

(ii) and (iii)

(i) and (iv)

Common salt besides being used in kitchen can also be used as the raw material for making (i) Washing soda (ii) Bleaching powder (iii) Baking soda (iv) Slaked lime *

1 point

(i), (ii) and (iv)

(i), (ii) and (iii)

(i) and (ii)

(i), (iii) and (iv)