what is being reduced and oxidised when calcium reacts with water
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When ca +h2o= cao+H2
so the reduction is of H2 and ca is oxidation
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Ca + H2O = Ca(OH) 2 + H2
As we see in the products, the Ca is in a compound and you can recognise that it has a +2 charge. So the Ca oxidation state changed from 0 to +2. '''So Ca was oxidised'''''. The hydrogen in the products is in elemental form so it has oxidation state of 0. The H changed from +1 to 0. '''So H was reduce''''.
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