2. Which substance cannot reduce iron(III) to iron?
A. Carbon dioxide
B.Carbon monoxide
C.Coke(carbon)
D.Hydrogen
3. Why does the color of potassium iodide change to brown when chlorine is bubbled through it?
A. A compound is formed between chlorine and potassium iodide.
B. Chlorine oxidizes iodide ions to iodine.
C. Iodine reacts with starch to give a blue color.
D. Potassium chloride is formed which is colored.
4. Which conversion is not an example of reduction?
A. Chlorine to hydrogen chloride.
B. Iron to Iron(II) oxide.
C. Iron(III) oxide to iron.
D. Nitrogen to ammonia.
5. Which reaction is a redox reaction?
A. Barium chloride+ potassium sulphate–>
Barium sulphate+potassium chloride
B. Potassium hydroxide+hydrochloric acid->
Potassium chloride+water
C.Potassium iodide+chlorine–>
Potassium chloride+iodine
D.Silver nitrate+ potassium chloride–>
Silver chloride+ potassium nitrate
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