In the electrolytic refining of a metal $M$, what would you take as the anode, the cathode and the electrolyte ?
In the electrolytic refining of a metal $M$ :
Anode $\rightarrow$ Impure metal $M$
Cathode $\rightarrow$ Thin strip of pure metal $M$
Electrolyte $\rightarrow$ Solution of salt of the metal $M$
$(i)$ 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 ?
Define the following terms.
$(i)$ Mineral $(ii)$ Ore $(iii)$ Gangue
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $H_2SO_4$.
What are amphoteric oxides? Give two examples of amphoteric oxides.