Question

A metal strip X is dipped in blue colored salt solution $YS{O_4}$. After sometimes a layer of metal ‘Y’ is formed on metal X is used in galvanization whereas mutual Y is used for making electric wire.
a) What could be metal X and Y.
b) Name the metal salt $YS{O_4}$
c) What type of chemical reaction takes place between X and $YS{O_4}$ write the chemical equation.

Answer 1

Hint: We know that the reaction in which one atom or a group is displaced by another atom or group in a molecule is defined as displacement reaction.
\[A{\text{ }} + {\text{ }}B - C{\text{ }} \to {\text{ }}A - C{\text{ }} + {\text{ }}B\]
For instance, if iron is added to a solution of copper sulphate the iron replaces the copper metal.

Complete step by step answer:
a) The metal strip dipped in the blue color solution X is zinc.

b) We know the blue vitriol is also called copper sulfate pentahydrate and the chemical formula is $CuS{O_4}.5{H_2}O$. Thus the blue color metal salt is copper sulfate. The salts that do not have water molecules are called anhydrous salt. Copper sulfate is a hydrated salt that is on heating, loses its water molecules and gives anhydrous copper sulfate.

c) In the chemical reaction if one metal is replaced by another compound to give a new product is called a chemical displacement reaction.
Example: \[Zn\left( s \right) + CuS{O_4}\left( {aq} \right)\xrightarrow{{}}ZnS{O_4}\left( {aq} \right){\text{ }} + Cu\left( s \right)\]

Additional Information:
Now we can discuss about the displacement reaction with an example as,
If chlorine is added to a sodium bromide solution, the bromine ion is replaced by chlorine ion. Because bromine is a smaller amount reactive than the bromine so it displaces bromine from sodium bromide. Then it turns brown and therefore the color change indicates the displaced bromine. The chlorine has gone to make common salt.
$C{l_2}\left( g \right) + 2NaBr \to 2NaCl + B{r_2}\left( g \right)$
In this equation, the Chlorine and Bromine have changed their positions.
This type of displacement happens with all the halogens.

Note:
We must remember that the halogens within the solutions of their salts are displaced by the foremost reactive halogen, and is itself displaced by none of the others and therefore the least reactive halogen displaces doesn't replace the other atoms, and it's displaced by itself by the opposite entire atom within the solution.