Which of the following chemical equations represents a redox reaction? A. Mg(OH)2 + 2HCl → MgCl2 + 2H2O B. BiCl3 + Na2SO4 → 2NaCl + Bi2(SO4)3 C. CH4 + 2O2 → CO2 + 2H2O D. 3NaOH + H3PO4 → Na3PO4 + 3H2O
Chemistry · Middle School · Thu Feb 04 2021
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Answer: A redox reaction (reduction-oxidation reaction) involves a transfer of electrons between two species. To identify a redox reaction, you need to look for changes in the oxidation numbers of the atoms involved in the reaction.
Let's check the options given:
A. Mg(OH)2 + 2HCl → MgCl2 + 2H2O This is not a redox reaction. It is a double displacement reaction, involving the exchange of ions, but there is no change in the oxidation numbers of the atoms involved.
B. BiCl3 + Na2SO4 → 2NaCl + Bi2(SO4)3 This is also not a redox reaction. Like option A, it is a double displacement reaction without a change in oxidation numbers.
C. CH4 + 2O2 → CO2 + 2H2O This is a redox reaction. The carbon in CH4 is oxidized from -4 to +4, and oxygen is reduced from 0 in O2 to -2 in CO2 and H2O.
D. 3NaOH + H3PO4 → Na3PO4 + 3H2O This is not a redox reaction but a neutralization reaction without any change in the oxidation states of the atoms present.
Therefore, the chemical equation that represents a redox reaction is C.