Subject Experts Solutions for Chapter: Oxidation, Reduction and Electrochemistry, Exercise 1: Practice Exercise

In ${\mathrm{KMnO}}_4$ molecule, the oxidation states of the elements potassium $\left(\mathrm{K}\right),$ manganese $\left(\mathrm{Mn}\right)$ and oxygen are, respectively:

Statement $\mathrm{I}$: Zinc is used for galvanization to protect iron from rusting.

Statement $\mathrm{II}$: Zinc is more reactive towards oxygen than iron.

A gas is evolved when a piece of zinc metal is placed in dilute sulphuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$. What is the gas?

Which one of the following is correct regarding the reaction of fluorine with water?

$2 {\mathrm{F}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)⟶4{\mathrm{H}}^{+}\left(\mathrm{aq}\right)+4 {\mathrm{F}}^{-}\left(\mathrm{aq}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)$

What is the oxidising agent in the following equation?

${\mathrm{HAsO}}_2\left(\mathrm{aq}\right)+{\mathrm{Sn}}^{2+}\left(\mathrm{aq}\right)+{\mathrm{H}}^{+}\left(\mathrm{aq}\right)⟶\mathrm{As}\left(\mathrm{s}\right)+{\mathrm{Sn}}^{4+}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

In the reaction, $\mathrm{ZnO}+\mathrm{C}⟶\mathrm{Zn}+\mathrm{CO}, \mathrm{C}$ acts as a/an

White phosphorus glows in the dark due to _____.

Which one of the following is a reduction reaction?