Refer to the question below.......please give solid explanation for the answer......?
Aqueous potassium iodide, KI(aq), can be used as a test reagent in redox reactions.
Iodide ions are readily ......X...... . A positive result for the test is when the solution changes
colour from ......Y...... to ......Z...... .
Which words correctly complete gaps X, Y and Z?
X. Y. Z.
A oxidised ...... brown............... colourless
B oxidised ....... colourless....... brown
C reduced ....... brown.............. colourless
D reduced ....... colourless........ brown
Aqueous potassium iodide, KI(aq), can be used as a test reagent in redox reactions.
Iodide ions are readily ......X...... . A positive result for the test is when the solution changes
colour from ......Y...... to ......Z...... .
Which words correctly complete gaps X, Y and Z?
X. Y. Z.
A oxidised ...... brown............... colourless
B oxidised ....... colourless....... brown
C reduced ....... brown.............. colourless
D reduced ....... colourless........ brown
1 Answer
The correct answer is B oxidized … colourless… brown.
Explanation:
Iodide ions,
They cannot be reduced to a lower oxidation state.
Hence, the iodide ions must be oxidised.
The most likely oxidation product is iodine,
An aqueous solution of iodine has a yellow-brown colour.
The equation for the oxidation half-reaction is:
