Question

When methane undergoes combustion in air, the oxidation number of C ____________.

पर्याय

• increases from −4 to +4

• decreases from +4 to −4

• increases from −4 to 0

• decreases from +4 to +2

Answer 1

When methane undergoes combustion in air, the oxidation number of C increases from −4 to +4.

Explanation:

$$\begin{array}{c}\underset{-4}{\underset{\uparrow }{\mathrm{C}}}\mathrm{H}{\phantom{A}}_{4(\mathrm{g})}+\mathrm{O}{\phantom{A}}_{2(\mathrm{g})}⟶\underset{+4}{\underset{\uparrow }{\mathrm{C}}}\mathrm{O}{\phantom{A}}_{2(\mathrm{g})}+2\mathrm{H}{\phantom{A}}_2\mathrm{O}{\phantom{A}}_{(\mathrm{l})}\end{array}$$