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This quiz contains 9 questions from a mix of 1 subtopics.
Oxidation is the of electrons and reduction is the of electrons.
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What is the reducing agent in the reaction: CuO(s) + H2(g) ➔ Cu(s) + H2O(l)?
H2
H2O
Cu
CuO
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What is the oxidising agent in the reaction: Cl2(g) + H2(g) ➔ 2HCl(g)?
H2O
H2
Cl2
HCl
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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 following reaction, chlorine is the agent and magnesium is the agent.
Mg(s) + Cl2(g) ➔ MgCl2(s)
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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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