Question

(A) Write the balanced chemical equation of the following word equation.
Potassium dichromate$+$ sulphuric acid $\to$potassium sulphate $+$ chromium sulphate$+$ water $+$ oxygen

(B) What is the difference between displacement and double displacement reaction? Write equations for these reactions.

Answer 1

Balanced chemical equation:
$2K_{2}C{r}_2{O}_7+8H_{2}S{O}_4\to 2K_{2}S{O}_4+2C{r}_2(S{O}_4{)}_3+8H_{2}O+3O_2$

(B) In a displacement reaction, a more reactive element displaces a less reactive element from its compound or salt solution.
For example: ${\text{CuSO}}_4\text{(aq)}+\text{Zn(s)}\to {\text{ZnSO}}_4\text{(aq)}+\text{Cu(s)}$

In a double displacement reaction, two compounds react by exchanging their ions to form new compounds. It is typically identified by the formation of a product that is a precipitate.
For example: ${\text{Na}}_2{\text{SO}}_4\text{(aq)}+{\text{BaCl}}_2\text{(aq)}\to {\text{BaSO}}_4\text{(s)}+2\text{NaCl(aq})$