51. NCERT Exemplar XXIV

 

Ammonium chloride sublimation is a form changeschemical changesstate changesphysical change in which a solid-state transforms into a vapoursolidgaseousliquid state.

 

An oxidising agent (oxidant) is a substance that oxidized another substance (by losing electrons or removing hydrogen or adding oxygen, or increasing oxidation state) while also being burnedmeltedreducedoxidized.

 

$CuSO_4$ + $Zn$ → $Cu$ + $CuSO_4$$Zn$ + $ZnSO_4$$Cu$ + $ZnSO_4$$Zn$ + $CuSO_4$

 

$CuSO_4$ is an oxidizer because it converts $Zn$ to $ZnSO_4$.​