Tag: reactivity series and electrochemistry

Reactivity of metal depend on the formation of positive ions by losing electron. Sodium have more tendency to form positive ion than copper. Therefore sodium is more reactive than copper.

Metals which lose electrons less readily than hydrogen are said to be less reactive than hydrogen. All metals placed below hydrogen in the reactivity series lose electrons less readily than metals placed above hydrogen.

The metals at the top of the activity series an so reactive that they are never found in nature as free elements.

In the reactivity series, metals placed at the top are more reactive like sodium, potassium, calcium, magnesium etc.

Mercury, silver, gold are placed below copper in the reactivity series. These are also less reactive than hydrogen.

Only those metals which are more reactive than hydrogen, displace hydrogen from acids to form salts and evolve hydrogen gas. Out of the given elements, only $Na$ is a metal which is more reactive than hydrogen.

Metal $A$ displaces metal $B$ from its solution. Hence, it is more reactive than $B$.

In the activity series of metal $Zn$ is above the $Cu$ metal. So it can easily reduce $Cu^{2+}$ in the solution.

$Z$ is more reactive. It replaced lead from its compound.

Food cans are coated with tin and not with zinc because zinc is above the tin in reactivity series means more reactive than tin and can react with food elements preserved in it.