Question

In metal reactivity series the more reactive metals are at
A. top
B. bottom
C. middle
D. none

Answer 1

In metal reactivity series, it is known that reactivity decreases as we move down the group.

Complete step by step answer:
The metal reactivity series is also known as the activity series. In the metal reactivity series the metals are arranged on the basis of their decreasing order of reactivity. In the metal reactivity series the most reactive metals i.e. the group 1 metals lie at the top. Group 1 metals are also known as alkali metals. The examples of alkali metals are lithium, sodium and potassium. The group 1 metals are then followed by the group 2 metals whose reactivities are marginally less than them. Group 2 metals are also known as alkaline earth metals. After that the transition metals which are much less reactive occupy ranking in the metal activity series. Examples of transition metal are iron, nickel, copper, etc. At the last or bottom of the metal activity series the least reactive metals for example; gold, platinum, etc are placed.
The metal reactivity series has been obtained by performing displacement reactions between the different metals and their salt solutions. So with the help of the metal reactivity series it can be concluded that a more reactive metal will displace the less reactive metal in any reaction from a compound. Also, the more reactive the metal will be, the more will be its tendency to lose electrons.
Reactivity series-

Metals

Potassium (most reactive)
Sodium
Calcium
Magnesium
Aluminium
Zinc
Iron
Lead
Hydrogen
Copper
Mercury
Silver
Gold (least reactive)

Let us look at this example for instance:
$Zn\, + \,{H_2}S{O_4} \to ZnS{O_4} + {H_2}$
From this reaction we can conclude that Zinc is more reactive than hydrogen atom.

So, the correct answer is “Option A”.

Note:
Thus, metal reactivity series is the series based on the reactivity of the metals. The more reactive metals are kept at the top of the series followed by the ones with the lower reactivity. The more reactive a metal will be the more will be its tendency to lose electrons. The metals in the metal reactivity series are arranged in the following manner; Group1 metals > group 2 metals > transition metals > least reactive metals.