Justify that the following reaction is a redox reaction:

$\mathrm{CuO}\left(\mathrm{s}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)\to \mathrm{Cu}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

Justify that the following reaction is a redox reaction:

${\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+3\mathrm{CO}\left(\mathrm{g}\right)\to 2\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

Justify that the following reaction is redox reaction:

$4{\mathrm{BCl}}_3\left(\mathrm{g}\right)+3{\mathrm{LiAlH}}_4\left(\mathrm{s}\right)\to 2{\mathrm{B}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)+3\mathrm{LiCl}\left(\mathrm{s}\right)+3{\mathrm{AlCl}}_3\left(\mathrm{s}\right)$

Justify that the following reaction is redox reaction:

 $2\mathrm{K}\left(\mathrm{s}\right)+{\mathrm{F}}_2\left(\mathrm{g}\right)\to 2{\mathrm{K}}^{+}{\mathrm{F}}^{-}\left(\mathrm{s}\right)$

Justify that the following reaction is a redox reaction:

$4{\mathrm{NH}}_3+5{\mathrm{O}}_2\left(\mathrm{g}\right)\to 4\mathrm{NO}\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

Fluorine reacts with ice and results in the change:
${\mathrm{H}}_2\mathrm{O}\left(\mathrm{s}\right)+{\mathrm{F}}_2\left(\mathrm{g}\right)\to \mathrm{HF}\left(\mathrm{g}\right)+\mathrm{HOF}\left(\mathrm{g}\right)$

Justify that this reaction is a redox reaction.

Write a formula for the following compound, Mercury(II) chloride.

Write formula for the following compound, Nickel(II) sulphate.