CAIE IGCSE Chemistry 6.4.4 Redox Reactions As Reactions Involving Questions

Identify redox equations by checking for simultaneous oxidation and reduction, distinguished from precipitation, neutralisation and acid–carbonate reactions.

Exam points

identify a redox equation by finding simultaneous oxygen gain and oxygen loss
distinguish redox from precipitation, neutralisation and acid–carbonate equations
track oxygen across an unfamiliar equation to identify oxidation and reduction

[Maximum number: 1]

Which equation represents a redox reaction?

$\mathrm{AgNO}_{3}+\mathrm{NaCl} \rightarrow \mathrm{AgCl}+\mathrm{NaNO}_{3}$

$\mathrm{PCl}_{5}+4 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{3} \mathrm{PO}_{4}+5 \mathrm{HCl}$

$3 \mathrm{Fe}+4 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Fe}_{3} \mathrm{O}_{4}+4 \mathrm{H}_{2}$

$\mathrm{MgCO}_{3}+2 \mathrm{HCl} \rightarrow \mathrm{MgCl}_{2}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$

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CAIE IGCSE Chemistry 6.4.4 Redox Reactions As Reactions Involving Questions question 1