**Fill in the following blanks with suitable words:**
(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 stripes 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.
(a) Hydrogen.
(b) Magnesium oxide.
(c) Aluminium oxide.
(d) Sodium; Diamond.
(e) Less.
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