Complete the following by selecting the correct option from the choices given –

(i) The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction …………… [Fe/Mg/Pb/Al]

(ii) The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is …………… [Al/Na/Mg/K]

Name the main component of the alloy -

(i) Brass

(ii) Duralumin

Fill in the blank with the correct choice given in the bracket - The most common ore of iron is ……………[calamine/haematite]

Give a reason for : Alkali metals are good reducing agents.