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WorksheetsMoles, redox and electrolysis
Total questions: 11
Worksheet time: 9mins
Which of the following represents the observation when silver nitrate is added to chloride ions
white solution
white ppt
colourless solution
yellow ppt
When a concentrated solution of potassium chloride solution is electrolysed using inert electrodes, the substance produced at the anode would be...
(a)
A mole of a substance ....
contains 6 x 10^23 ions of that substance
contains 6 x 10^23 particles of that substance
contains 6 x 10^23 molecules of that substance
contains 6 x 10^23 atoms of that substance
Sulphur dioxide causes acidified potassium dichromate to go from orange to green. What can one deduce about sulphur dioxide?
It has reducing properties
It has no redox properties
It has oxidising properties
It has both oxidising and reducing properties
When dilute copper sulphate solution is electrolysed using copper electrodes, what happens to the mass of the anode after electrolysis?
It remains the same
It gets larger
It gets smaller
It gets larger then smaller
When dilute copper sulphate solution is electrolysed using copper electrodes, state what happens to the colour of the eletrolyte after electrolysis had finished.
It remains the same
It gets darker
It gets lighter
It goes colourless immediately
Mohr's salt in the hydrated form has the formula (NH4)2Fe(SO4)2.6H2O. How many atoms are in ONE unit of Mohr's salt?
10
39
28
29
Mohr's salt in the hydrated form has the formula (NH4)2Fe(SO4)2.6H2O. How many moles are present in 10 g of Mohr's salt? Ar N = 14, H = 1, S = 32, O = 16, Fe = 56. Just write the value ONLY (NO WORDS) to 2 significant places
(a)
The electrochemical series is used to determine which ...... is preferentially discharged at the.....
cation and anode
anion and cathode
cation and cathode
anion and anode
Molten lead(II) bromide is being electrolysed using inert electrodes. Which of the following equations represents the reaction at the ANODE?
Pb2+ + 2e --> Pb
Br- - e --> Br
2Br- - 2e --> Br2
Pb2+ - 2e --> Pb
A substance is electrolysed using inert electrodes. Hydrogen gas was produced at the cathode and oxygen gas at the anode. Which of the following electrolytes could this substance be?
dilute copper(II) sulphate solution
dilute sodium chloride solution
concentrated sodium chloride solution
concentrated copper(II) sulphate solution
