• # question_answer 1) In the reactions given below, identify the species undergoing oxidation and reduction : (i) ${{H}_{2}}S(g)+C{{l}_{2}}(g)\to 2HCl(g)+S(s)$ (ii)$3F{{e}_{3}}{{O}_{4}}(s)+8Al(s)\to 9Fe(s)+4A{{l}_{2}}{{O}_{3}}(s)$ (iii) $2Na(s)+{{H}_{2}}(g)\to 2NaH(s)$

(i) ${{H}_{2}}S$ is oxidised to sulphur due to removal of hydrogen. Chlorine ($C{{l}_{2}}$) is reduced to $HCl$ due to combination with hydrogen. (ii) Aluminium is oxidised due to combination with oxygen while $F{{e}_{3}}{{O}_{4}}$ is reduced due to removal of oxygen from it. (iii) In this reaction sodium is oxidised while hydrogen is reduced. One electron is transferred from sodium to hydrogen.