Samples of four metals $A$, $B$, $C$ and $D$ were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
Metal | Iron $(II)$ sulphate | Cooper $(II)$ sulphate | zinc sulphate | Silver nitrate |
$A.$ | No reaction | Displacement | ||
$B.$ | Displacement | No reaction | ||
$C.$ | No reaction | No reaction | No reaction | Displacement |
$D.$ | No reaction | No reaction | No reaction | No reaction |
Use the Table above to answer the following questions about metals $A$, $B$, $C$ and $D$.
$(i)$ Which is the most reactive metal ?
$(ii)$ What would you observe if $B$ is added to a solution of Copper $(II)$ sulphate ?
$(iii)$ Arrange the metals $A$, $B$, $C$ and $D$ in the order of decreasing reactivity.
Define the following terms.
$(i)$ Mineral $(ii)$ Ore $(iii)$ Gangue
Which of the following methods is suitable for preventing an iron frying pan from rusting ?
In the electrolytic refining of a metal $M$, what would you take as the anode, the cathode and the electrolyte ?
Why is sodium kept immersed in kerosene oil ?