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General Chemistry

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Redox Reaction

CHEM-IEYGET

Which of the following is an oxidation-reduction reaction?

A

${ Ca }^{ 2+ }(aq)\space +\space { C }_{ 2 }{ O }_{ 4 }^{ \space 2- }(aq)\space \longrightarrow \space Ca{ C }_{ 2 }{ O }_{ 4 } (s)$

B

${ NaHCO }_{ 3 }(aq)\space +\space C{ H }_{ 3 }COOH(aq)\space \longrightarrow \space C{ H }_{ 3 }COONa(aq)\space +\space { H }_{ 2 }O(l)\space +\space C{ O }_{ 2 }(g)$

C

$Fe(s)\space +\space { Cu }^{ 2+ }(aq)\space \longrightarrow \space { Fe }^{ 2+ }(aq)\space +\space Cu(s)$

D

${CaCO }_{ 3 }(s)\space +\space 2HCl(aq)\space \longrightarrow \space {CaCl }_{ 2 }(aq)\space +\space { H }_{ 2 }O(l)\space +\space C{ O }_{ 2 }(g)$