Name two metals which are both malleable and ductile.

(a) Magnesium liberates ________ gas on reacting with hot boiling water.

(b) The white powder formed when magnesium ribbon burns in oxygen is of ________

(c) Ordinary aluminium strips are not attacked by water because of the presence of a layer of ________ on the surface of aluminium.

(d) A metal having low melting point is ________ but a non-metal having very high melting point is ________

(e) Calcium is a ________ reactive metal than sodium.