Question

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number ?

• A. Cl
• B. C
• C. S
• D. H

Answer 1

Answer: (A)

Cl

Answer 2

$KClO _{3}+ C _{2} O _{4} H _{2}+ H _{2} SO _{4} \rightarrow K _{2} SO _{4}+ CO _{2}+ Cl _{2}+ H _{2} O$

Maximum change in oxidation number $= Cl$