Question

What type of chemical reactions are represented by the following equations?
1) $A + BC \to AC + B$
2) $A + B \to C$
3) $X \to Y + Z$
4) $PQ + RS \to PS + RQ$
5) ${A_2}{O_3} + 2B \to {B_2}{O_3} + 2A$

Answer 1

Hint: We know that there are 5 primary types of chemical reaction: Combination reaction, displacement reaction, double displacement, decomposition, precipitation reaction. On the left side of the reaction, there are reactants and on the right side, we have a product. Based on product formation we will find what type of reaction it is.

Complete answer:
To solve this problem first we will discuss various types of reactions.
1) Combination reaction- When two or more reactants react to each other to form a product known as a combination reaction.
$A + B \to C$
Synthesis reactions are an example of a combination reaction.
Example - $2Na + C{l_2} \to 2NaCl$
Hence $A + B \to C$ this reaction is an example of a combination reaction.
Because here A and B combine to give product C.
2) Displacement reaction- When a more reactive element displaces a less reactive element from its aqueous salt solution known as displacement reaction. Sometimes it’s called substitution reaction also.
$X + YZ \to XZ + Y$
Example – $CuS{O_4} + Fe \to FeS{O_4} + Cu$
Hence, $A + BC \to AC + B$ represent displacement reaction, here A substitutes B to form compound AC.
${A_2}{O_3} + 2B \to {B_2}{O_3} + 2A$ in this equation also B replaces A.
3) Double displacement reaction- If in a reaction an element gets exchange between two compounds known as double displacement reaction. These reactions are also known as metathesis reactions.
$XY + ZA \to XZ + YA$
Example- $N{a_2}S{O_4} + BaC{l_2} \to BaS{O_4} + 2NaCl$
Hence, $PQ + RS \to PS + RQ$ this equation shows the double displacement. P displaces R and Q combines with R.
4) Decomposition reaction- When a compound deforms into two or more compounds called decomposition reaction. This reaction is just the reverse of a combination reaction.
$XY \to X + Z$
Example- $CaC{O_3}\xrightarrow{\Delta }CaO + C{O_2}$
Hence, $X \to Y + Z$ this equation shows decomposition. X breaks into Y, Z.

Note:
To solve this type of problem first we should know about different types of reactions and their mechanism that how they react. The reaction should be balanced. In displacement reaction check which element is more reactive if the reaction is possible or not.