(a) What is a redox reaction ? Explain with an exampe.
(b) When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced ? Why ?
(c ) In the reaction represented by the equation:
`MnO_(2)+4HCl to MnCl_(2)+2H_(2)O+Cl_(2)`
`(i)"name the substance oxidised."" "(ii)"name the oxidising agent."`
`(iii)"name the substance reduced."" "(ii)"name the reducing agent."`

Answer

(b) Magnesium is oxidised ; Addition of oxygen to magnesium takes place (c ) (i) HCl (ii) `MnO_(2)` (iii) `MnO_(2)` (iv) HCl