Oxidising and Reducing agents

Question 1

oxidising agent

Answer 1

substance that oxidises another substance and itself gets reduced

Question 2

reducing agent

Answer 2

substance that reduces another substance and itself gets oxidised

Question 3

test for a reducing agent

Answer 3

oxidising agent used
- acidified potassium manganate(VII) KMnO4 (aq)
=> purple solution turns colourless
- acidified potassium dichromate(VI) K2Cr2O7 (aq)
=> orange solution turns green
- halogen (e.g. chlorine Cl2 (aq))
=> bromide: colourless solution turns orange
=> iodide: colourless solution turns brown

Question 4

test for an oxidising agent

Answer 4

reducing agent used
- potassium iodide KI (aq)
   => colourless solution turns brown
- reactive metals (e.g. Al, Zn)
   => less reactive metal is produced
- hydrogen H2
   => reddish-brown solid Cu is formed