Acids Bases and Salts Class 10

When hydrogen chloride gas is prepared 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 -

• Absorb the evolved gas

• Moisten the gas

• Absorb moisture from the gas

• Absorb Cl^– ions from the evolved gas

In terms of acidic strength, which one of the following is in the correct increasing order?

• Water < Acetic acid < Hydrochloric acid

• Water < Hydrochloric acid < Acetic acid

• Acetic acid < Water < Hydrochloric acid

• Hydrochloric acid < Water < Acetic acid

What is formed when zinc reacts with sodium hydroxide?

• Zinc hydroxide and sodium

• Sodium zincate and hydrogen gas

• Zinc oxide and hydrogen gas

• Sodium zincate and water

Tomato is a natural source of which acid?

• Acetic acid

• Citric acid

• Tartaric acid

• Oxalic acid

Lime water reacts with chlorine to give -

• bleaching powder

• baking powder

• baking soda

• washing soda

Identify the element –

a) It is a white translucent solid.

b) It readily reacts with water and produces an alkaline solution.

c) It is stored in kerosene

• Sodium

• Calcium

• Aluminium

• Phosphorus

Tooth enamel is made up of -

• Sodium hydroxyzinctite

• Potassium bicarbomagnetite

• Calcium hydroxyapatite

• Calcium Oxyzinctite

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

• Baking powder

• Ammonium hydroxide solution

• Hydrochloric acid

• Lime

Sodium hydroxide turns phenolphthalein solution -

• indigo

• orange

• pink

• violet

Lichen belongs to which division of the plant kingdom?

• Thallophyta

• Bryophyta

• Angiosperms

• Gymnosperms