Acid base and salt By MLZS, Nagpur

Which of the following feel soapy on touching?

• Acid

• Base

• Salt

• None of these

Which of the following is a natural indicator?

• China rose petal

• Turmeric

• Litmus

• All of these

Which of the following is basic in nature?

• Lime water

• Baking soda

• Both (a) and (b)

• water

On adding phenolphthalein indicator to a colourless solution, no change is observed. The nature of the solution may be

• acidic or basic

• basic

• acidic or neutral

• basic or neutral

The correct way of making a solution of acid in water is to

• add water to acid

• add acid to water

• mix acid and water simultaneously

• add water to acid in a shallow container

Neutralisation reaction is a

• physical and reversible change

• physical and irreversible change

• chemical and reversible change

• chemical and irreversible change

When a drop of vinegar solution is put on the litmus paper, it turns

• red

• blue

• green

• yellow

Products of a neutralisation reaction are always

• an acid and a base

• an acid and a salt

• a salt and water

• a salt and a base

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?

• Yellow in both acid and base

• Yellow in acid and red in base

• Pink in acid and yellow in base

• Red in acid and blue in base

An antacid tablet is given to a person when he suffers from

• obesity

• acidity

• dog bite

• none of these