Question

All of the following metals can displace aluminium
from its salt solution except
Ca
Zn
Mg
K​

Answer 1

Answer:

Correct option is

B

Ag

In a displacement reaction, a more reactive metal of the activity series can displace a less active one in its salt solution.

Reactivity order is:

Mg>Zn>Cu>Ag.

Thus, we see that Ag is least reactive and of the given four metals, Ag would be displaced from the solution of its salts by the other three metals.

Answer 2

A more reactive metal from the activity series can displace a less reactive one in its salt solution in a displacement reaction.

The order of reactivity is:

K>Ca>Mg>Zn

As a result, Zn is the least reactive metal, and the other three metals would displace Al from the solution of its salts.

All of the following metals can displace aluminium from it's salt solution except for Zinc.

Displacement Reaction

A displacement reaction is a type of reaction in which a portion of one reactant is displaced by another reactant. It is also known as a replacement reaction. As one ion of reactant is replaced by another ion of reactant.

Displacement reactions are classified into two types:

• Single displacement reaction
• Double displacement reaction

Single displacement reactions occur when one element replaces another element from its salt or compound.

Metals and their salts, in general, exhibit single displacement reactions. More reactive metal displaces less reactive metal from its salt in these reactions.

Reactivity Series

The reactivity series is a metal series ordered by reactivity from highest to lowest. As a result, the metal reactivity series can be defined as a series of metals arranged in decreasing order of reactivity. It is also referred to as the activity series.

Replacement Reactions

• Single Replacement Reaction:- When one element in a molecule is swapped for another, a single replacement reaction, also known as a single displacement reaction, occurs.
• Double-Replacement Reactions:- When two ionic compounds' components are swapped, two new compounds are formed. Double displacement, exchange, and metathesis reactions are other names for double replacement reactions.

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