Answer :

(a) Hydrogen gas is liberated when magnesium react with hot boiling water.

(b) When magnesium ribbon burns in oxygen is of magnesium oxide, the white powder is formed.

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

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

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

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