Metallic oxides of zinc, magnesium and copper were heated with the following metals.
Metal | Zinc | Magnesium | Copper |
Zinc oxide | - | - | - |
Magnesium oxide | - | - | - |
Copper oxide | - | - | - |
In which cases will you find displacement reactions taking place ?
Metal | Zinc | Magnesium | Copper |
Zinc oxide | No reaction | Displacement | No reaction |
Magnesium oxide | No reaction | No reaction | No reaction |
Copper oxide | Displacement | Displacement | No reaction |
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Differentiate between metal and non-metal on the basis of their chemical properties.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $H_2SO_4$.
$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.
$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.
$(iii)$ What are the ions present in these compounds ?
Name two metals which are found in nature in the free state.