Question

Which of the following pairs of reactants is likely to produce a pure metal when the
reactants react together?
A Na3PO4(aq) + Mg(NO3)2(aq) →
B Al(s) + CuCl2(aq) →
C Mg(s) + O2(g) →
D Cl2(aq) + KI(aq) →

Answer 1

1. Na3PO4+Mg(NO3)2= NaNO3 + MgPO4
So this is not the answer.
2. Al+CuCl2= AlCl3+ Cu
So this is the answer.
3. Mg+O2= MgO2
So this is not an answer
4. Cl2+KI= KCl+I2
So this is also an answer

Hence B and C are answers

Answer 2

The pairs of reactants that is likely to produce a pure metal when the reactants react is  2Al(s) + 3CuCl₂(aq) → 2AlCl₃ + 3Cu

The pairs of reactants that is likely to produce a pure metal when the reactants react is

• 2Al(s) + 3CuCl₂(aq) → 2AlCl₃ + 3Cu

This reaction will conveniently produce a pure metal because Aluminium will displace copper from its compound.

The easy displacement of copper is because aluminium is higher in the electrochemical series than copper.

The reaction is called a displacement reaction.

The product of the reaction will be Aluminium chloride and copper. Copper is the pure metal formed.

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