5.1 Obtaining and using metals

Aluminium powder displaces copper from copper(II) sulfate solution.

Which row gives the correct ionic equation and the correct description of the electron transfer?

[1]

$Al+Cu2+→Al3++Cu\mathrm{Al + Cu^{2+} \rightarrow Al^{3+} + Cu}$ ; aluminium atoms lose electrons

$2Al+3Cu2+→2Al3++3Cu\mathrm{2Al + 3Cu^{2+} \rightarrow 2Al^{3+} + 3Cu}$ ; aluminium atoms lose electrons

$2Al+3Cu2+→2Al3++3Cu\mathrm{2Al + 3Cu^{2+} \rightarrow 2Al^{3+} + 3Cu}$ ; copper ions lose electrons

$3Al+2Cu2+→3Al3++2Cu\mathrm{3Al + 2Cu^{2+} \rightarrow 3Al^{3+} + 2Cu}$ ; copper ions gain electrons

Aluminium powder displaces copper from copper(II) sulfate solution.

Which row gives the correct ionic equation and the correct description of the electron transfer?

$Al+Cu2+→Al3++Cu\mathrm{Al + Cu^{2+} \rightarrow Al^{3+} + Cu}$ ; aluminium atoms lose electrons

$2Al+3Cu2+→2Al3++3Cu\mathrm{2Al + 3Cu^{2+} \rightarrow 2Al^{3+} + 3Cu}$ ; aluminium atoms lose electrons

$2Al+3Cu2+→2Al3++3Cu\mathrm{2Al + 3Cu^{2+} \rightarrow 2Al^{3+} + 3Cu}$ ; copper ions lose electrons

$3Al+2Cu2+→3Al3++2Cu\mathrm{3Al + 2Cu^{2+} \rightarrow 3Al^{3+} + 2Cu}$ ; copper ions gain electrons

5.1 Obtaining and using metals Questions