Chemical reactions

The molecule of Nobel gases consists of ……….. atom/s

• 2 similar atoms

• 2 different atoms

• One atom

• 3 atoms

There is triple covalent bond between …………… molecules.

• Water

• Oxygen

• Ammonia

• Nitrogen

The chemical formula of calcium carbonate is .

• CaO

• CaNO3

• Ca2CO3

• CaCO3

The salt that is formed of combination of positive atomic group and negative atomic group is ………

• NH4Cl

• (NH4)2CO3

• Na2SO4

• NH4Br

All the following turn the blue litmus paper into red except

• HCl

• H2SO4

• NaOH

• HNO3

The chemical formula of ferric oxide is ……….

• FeO

• Fe2O3

• Fe3O2

• FeO2

The valency of copper in (Cu2O) is …………..

• Monocalent

• divalent

• trivalent

• tetravalent

All of these salts dissolve in water except ……….

• Sodium chloride

• Silver chloride

• Potassium sulfate

• Sodium sulphide

Ammonia with concentrated HCl produce white clouds of ………….

• Ammonium hydroxide

• Ammonium chloride

• Sodium chloride

• Aluminum chloride

The number of atoms in ammonium carbonate is ………….atoms

• 10

• 11

• 14

• 9