Font size
Worksheetstransfer of electrons at a distance
Total questions: 15
Worksheet time: 13mins
Oxidising agent …………….. electrons
donate
accept
Electrons transfer from oxidising agent to reducing agent. True or false?
true
false
Carbon electrode that is dipped in an ……...…… agent is known as the positive terminal
(a)
…..…………… electrode is used in U-tube experiment.
Copper
Aluminium
Graphite
Zinc
Below are reducing agent except ...……….
(Can choose more than 1)
Potassium iodide
Potassium bromide
Acidified potassium manganate(VII)
Acidified potassium dichromate(VI)
Which half equation is a reducing half equation?
MnO4 – + 8H+ + 5e → Mn2+ + 4H2O
Cr2O7 2– + 14H+ + 6e → 2Cr3+ + 7H2O
Cl2 + 2e → 2Cl–
2Br– ---> Br2 + 2e
Iodine can be tested by …………….
Potassium hexacyanoferrate(II)
Starch solution
Potassium dichromate
Sodium hydroxide
Below are the solution that suitable to use as a salt bridge....
dilute sulphuric acid
tetrachloromethane
Sugar solution
salt solution
Fe2+ → Fe3+ + e
The colour of the solution turns from ……….. to …………..
brown , green
green , brown
green , colourless
colourless , brown
Cr2O72– + 14H+ + 6e → 2Cr3+ + 7H2O
the colour of the solution turns from ………… to …………...
yellow , green
yellow , colourless
green , orange
orange , green
MnO4– + 8H+ + 5e → Mn2+ + 4H2O
The colour of the solution turns from ……….. to …………...
colourless , green
purple , orange
purple, colourless
green , colourless
Which solution acts as reducing agent?
Bromine liquid
Iron(II) sulphate
Iron(III) sulphate
dilute sulphuric acid
Potassium iodide acts as …………………. in this experiment.
oxidising agent
reducing agent
10I- + 2MnO4- + 16H+ → 5I2 + ………….. + 8H2O
Fill in the blank
3Mn2+
Mn2+
2Mn2+
4Mn2+
Choose the solution below which can replace Potassium dichromate(VI).
Chlorine water
Iron(III) chloride
Potassium bromide
Potassium iodide
