Question

Give balanced equations for the following reactions:
(i) Potassium permanganate is heated with concentrated hydrochloric acid.
(ii) Lead sulphide is heated with hydrogen peroxide.
(iii) Ozone is treated with potassium iodide solution.

Answer 1

(i) Potassium permanganate is heated with concentrated hydrochloric acid to form potassium chloride, manganese chloride and chlorine.
$2KMn{O}_4+16HCl\to 2KCl+2MnC{l}_2+8H_{2}O+5C{l}_2$
(ii) Lead sulphide is heated with hydrogen peroxide to form lead sulphate.
$PbS+4H_2{O}_2\to PbS{O}_4+4H_{2}O$
(iii) Ozone is treated with potassium iodide solution to form iodine and potassium hydroxide.
$2KI+H_{2}O+O_3\to 2KOH+I_2+O_2$