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This quiz contains 8 questions from a mix of 1 subtopics.
Oxidation is the of electrons and reduction is the of electrons.
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Redox reactions always involve the transfer of .
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What is the term for the gain of electrons in a redox reaction?
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In the redox reaction MnO4- + 5Fe2+ + 8H+ ➔ Mn2+ + 5Fe3+ + 4H2O, how many electrons are gained by MnO4-?
1
5
2
3
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In the redox reaction Sn + 4HNO3 ➔ SnO2 + 4NO2 + 2H2O, how many electrons are lost by Sn?
1
2
4
3
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What is the oxidation number of iron in Fe2O3?
+1
+2
+3
0
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2IO3- + 5HSO3- ➔ I2 + 5SO42- + 3H+ + H2O
In the reaction above, has been oxidised because its oxidation state has increased from to .
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2IO3- + 5HSO3- ➔ I2 + 5SO42- + 3H+ + H2O
In the reaction above, has been reduced because its oxidation state has decreased from to .
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