Acid, Bases and salts

Plaster of Paris is made from

• Lime stone
• Slaked Lime
• Quick lime
• Gypsum

Setting of Plaster of Paris takes place due to

• Oxidation
• Reduction
• Dehydration
• Hydration

Washing soda has the formula

• Na2CO3.7H2O
• Na2CO3.10H2O
• Na2CO3.H2)
• Na2CO3

BASE + ACID ----> SALT +?

• water
• oxygen
• hydrogen ion
• hydroxide ion

What is the name of this ion: H₃O⁺?

• helium ion
• hydrogen ion
• hepatic ion
• hydronium ion

A drop of solution 'X' is placed on a strip of pH paper. A deep red colour is produced. The solution 'X' is

• NaOH

• HCl

• H₂O

• Na₂CO₃

Which of the following base is used in the manufacture of bleaching powder?

• Sodium hydroxide

• Calcium hydroxide

• Potassium hydroxide

• Magnesium hydroxide

A colourless and odourless gas is liberated when hydrochloric acid is added to a solution of washing soda. The name of the gas is

• Carbon dioxide

• Nitrogen dioxide

• Sulphur dioxide

• Sulphur trioxide

The compounds obtained on heating baking soda are

• Sulphur dioxide and sodium carbonate

• Sodium bicarbonate, water and carbon dioxide

• Sodium carbonate, water and carbon dioxide

• Hydrochloric acid and water

A ___ is formed when an positive ion bonds with a negative ion.

• Acid
• base
• salt
• neutral ion