Acids, Bases and Salts

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

• Blue Vitriol

• Baking soda

• Washing soda

• Gypsum

A: Baking powder is used in making cake instead of using baking soda.

R: Baking powder contains tartaric acid which reacts with sodium carbonate and removes the bitter taste.

• Both A & R are true and R is the correct explanation of A

• Both A & R are true and R is not the correct explanation of A

• A is true but R is false

• A is false but R is true.

The colour of neutral litmus solution is

• red

• blue

• purple

• yellow

Which of the following indicators is an olfactory indicator?

• litmus

• vanilla

• turmeric

• phenolphthalein

When a drop of unknown solution X is placed on a strip of pH paper, a deep red colour is produced. Identify the unknown solution.

• Sodium hydroxide

• Hydrochloric acid

• Acetic acid

• Water

Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip

• turns red

• did not change

• turned green and slightly yellow

• turned pink

To relieve pain due to acidity, we can take

• sour milk

• lemon juice

• orange juice

• milk of magnesia

Which of the following salts is basic in nature?

• $NH_4NO_3$
  

• $Na_2CO_3$

• $Na_2SO_4$

• $NaCl$

Which one of the following is required to identify the gas evolved when dilute hydrochloric acid reacts with sodium carbonate?

• blue litmus paper

• red litmus paper

• a burning splinter

• lime water

The pH of a sample of pure water is 7 at room temperature. What is its pH when a pinch of sodium hydroxide is dissolved in it?

• Less than 7

• More than 7

• Equal to 7

• None of these