Question

An element reacts with oxygen to give a compound with a high melting point. The compound is soluble in water. The element is likely to be

(a) calcium
(b) carbon
(c) iron
(d) silicon

Answer 1

Answer:

calcium

Explanation:

As calcium oxide is soluble in water and has high melting point.

Answer 2

Answer:

a )calcium

CA+O2=Cap

it is chemical combination ( exo thermic reaction)