Chemistry class 10

The PH scale was invented by

• Robert Boyle

• Newton

• Sorensen

• Pascal

Which is slightly soluble in water

• NaOH

• KOH

• Mg(OH)2

• Be(OH)2

Which is a mild corrosive base

• Baking soda

• Bleaching powder

• Plaster of Paris

• Gypsum

Formula of bleaching powder

• CaSO4

• Na2CO3

• NaHCO3

• CaOCl2

Bases turn phenolphthalein to which colour

• Red

• Yellow

• Pink

• No change

Which of the following is acidic salt

• NaHSO4

• Na2SO4

• Na2SO3

• NaSO4

Brine solution is called

• MgCl2 solution

• Na2SO4 solution

• CuSO4 solution

• NaCl solution

Bleaching powder acts as

• Oxidizing agent

• Reducing agent

• Decolourising agent

• 1&3

Formula of baking soda

• CaSO4

• Na2CO3

• NaHCO3

• CaOCl2

PH value of lemon juice is

• 4.4

• 7.4

• 2.5

• 5.8