Question

In a basic medium, H₂O₂ exhibits which of the following reactions?

(A) $$\mathrm{Mn}{\phantom{A}}^{2+}⟶\mathrm{Mn}{\phantom{A}}^{4+}$$

(B) $$\mathrm{I}{\phantom{A}}_2⟶\mathrm{I}{\phantom{A}}^{-}$$

(C) $$\mathrm{PbS}⟶\mathrm{PbSO}{\phantom{A}}_4$$

Choose the most appropriate answer from the options given below.

पर्याय

• (A), (C) only

• (A), (B) only

• (A) only

• (B) only

Answer 1

(A), (B) only

Explanation:

Possible reactions in the basic medium are:

$$\mathrm{Mn}{\phantom{A}}^{2+}+\mathrm{H}{\phantom{A}}_2\mathrm{O}{\phantom{A}}_2⟶\mathrm{Mn}{\phantom{A}}^{4+}+2\mathrm{OH}{\phantom{A}}^{-}$$

$$\mathrm{I}{\phantom{A}}_2+\mathrm{H}{\phantom{A}}_2\mathrm{O}{\phantom{A}}_2+2\mathrm{OH}{\phantom{A}}^{-}⟶2\mathrm{I}{\phantom{A}}^{-}+2\mathrm{H}{\phantom{A}}_2\mathrm{O}+\mathrm{O}{\phantom{A}}_2$$

$$\mathrm{PbS}⟶\mathrm{PBSO}{\phantom{A}}_4$$ is possible in acidic medium

$$\mathrm{PbS}+4\mathrm{H}{\phantom{A}}_2\mathrm{O}{\phantom{A}}_2⟶\mathrm{PbSO}{\phantom{A}}_4+4\mathrm{H}{\phantom{A}}_2\mathrm{O}$$