Potassium chlorate (${\mathrm{KClO}}_3$) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas.

Balance the following equation:

${\mathrm{NH}}_3+\mathrm{CuO}\to \mathrm{Cu}+{\mathrm{N}}_2+{\mathrm{H}}_2\mathrm{O}$

Balance the following equation:

${\mathrm{Al}}_2({\mathrm{SO}}_4{)}_3+\mathrm{NaOH}\to \mathrm{Al}(\mathrm{OH}{)}_3+{\mathrm{Na}}_2{\mathrm{SO}}_4$

Balance the following equation:

${\mathrm{HNO}}_3+\mathrm{Ca}(\mathrm{OH}{)}_2\to \mathrm{Ca}({\mathrm{NO}}_3{)}_2+{\mathrm{H}}_2\mathrm{O}$

Balance the following equation:

$\mathrm{NaOH}+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{H}}_2\mathrm{O}$

Balance the following equation:

${\mathrm{BaCl}}_2+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{BaSO}}_4+\mathrm{HCl}$

Explain giving chemical equation any two uses of chemical decomposition reaction in industry.

When ${\mathrm{SO}}_2$ gas is passed through a saturated solution of, ${\mathrm{H}}_2\mathrm{S}$ the following reaction occurs:

${\mathrm{SO}}_2+2{\mathrm{H}}_2\mathrm{S}\to 2{\mathrm{H}}_2\mathrm{O}+3\mathrm{S}$

Name the substance reduced and oxidised.

Write the essential condition for the following reaction to take place

$2\mathrm{AgBr}\to 2\mathrm{Ag}+{\mathrm{Br}}_2$

Write one application of this reaction.