Acid bases and salts

Na2CO3 . 10H2O is

• washing soda

• baking soda

• bleaching powder

• tartaric acid

Which gas is evolved when acids react with metals?

• O2

• CO2

• H2

• N2

Chemical formula of baking soda is:

• CaCO3

• NaHCO3

• Ca(OH)2

• CaCl2

Egg shell is made up of

• MgSO4

• CaO

• CaCO3

• Ca(OH)2

Which of the following is not a acidic salt?

• CuSO4

• AlCl3

• FeCl3

• CH3COONa

Lime water reacts with chlorine to give

• bleaching powder

• baking powder

• baking soda

• washing soda

A solution has turned the colour of red litmus paper to blue. The pH of the solution is approximately:

• 2

• 5

• 7

• 10

Sodium hydroxide turns phenolphthalein solution

• Pink

• Yellow

• Colour less

• Orange

Tooth enamel is made up of

• calcium phosphate

• calcium carbonate

• calcium oxide

• None of the above

Sodium hydroxide is used

• as an antacid

• in manufacture of soap

• as a cleansing agent

• in alkaline batteries