The formation of calcium oxide from its elements is a reaction between
(a) two metals.
(b) two non-metals.
(c) a metal and a non-metal.
(d) an alkali and an acid.

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Solution

(c) a metal and a non-metal

Calcium, which is a metal, reacts with oxygen, which is a non-metal, to form calcium oxide.

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An element forms an oxide which is acidic in nature.Is the element a metal or non-metal?

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A_{2} O_{3}

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