Question

The list of metals arranged in the order of their chemical activity is called_________ series.
(A) Metal activity
(B) Radioactivity
(C) Transition
(D) All of these

Answer 1

Hint : As we know that metals are shiny in nature and they are good conductors of heat and electricity. We can make their thin sheets by beating them. It means they are malleable. They can be stretched into wire-ductile behavior. We can arrange these metals in order depending upon their chemical properties, physical properties and their reactivity with other elements.

Complete Step By Step Answer:
we can arrange metals according to their reactivity. The arrangement of their reactivities in descending order is known as reactivity series. Sometimes, it is also known as an activity series of metals. We also know that metals are ready to lose their electrons and acquire positive charge and become cations. With the help of reactivity series we can find out which metal is more reactive and which metal is least reactive.
Tabular form of the reactivity series:

METALS

Potassium
Sodium
Lithium
Barium
Calcium
Magnesium
Aluminium
Manganese
Zinc
Chromium
Iron
Cadmium
Cobalt
Nickel
Tin
Lead
Antimony
Copper
Mercury
Silver
Gold
Platinum

Looking at the above series we can defines some of the features of this reactivity series:
The first one includes the top position of the reactivity series which is acquired by metal that reacts vigorously with water and atmospheric oxygen. They are powerful reducing agents. They react with atmospheric oxygen and get easily oxidized. From the reactivity series we can see that potassium is the most reactive metal.
Then comes the bottom position of the reactivity series which is filled by metals which does not show any reactivity towards water and atmospheric oxygen. From the series we can see that Platinum is least reactive.
The electropositive character of the metals decreases as we go down the series.
Also, the Reducing power of metals also decreases as we go down the series.
The ability of metals to remove hydrogen from their hydride also decreases as we go down the series.
Therefore, option (A) is correct.

Note :
Try to remember this reactivity series. It is very useful in chemical reactions. With the help of this we can predict that (1) which metal in the solution loses electrons fast and forms a positive charge.
(2) We can compare the properties of metals based on their reactivity.
(3) Which metals have the ability to displace other metals in the reaction. For e.g.
$Fe(s) + CuS{O_4} \to FeS{O_4} + Cu(s)$ in this reaction iron displaces the copper because it is more reactive than the copper.