quiz 1

In the compound FeCO₃ the valency of iron is                                        

• 1

• 2

• 3

• 4

From the elements which have more than one valency are                      

• iron and chlorine

• chlorine and bromine

• iron and copper

• copper and zinc

The chemical formula of nitric acid is                                                         

• HNO₃

• HNO₂

• H₂NO₃

• H₂NO₂

The chemical formula of copper II oxide is                                                

• Cu₂O

• CuO₂

• Cu₂O₂

• CuO

The formula FePO₄ represents                                                                   

• iron I sulphate

• iron I phosphate

• iron II phosphate

• iron III phosphate

All the following are atomic groups except                                              

• NH₃

• NH₄

• CO₃

• SO₄

The maximum number of energy levels

• 6

• 7

• 8

• 9