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

Question 3. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
(a) calcium
(b) carbon
(c) silicon
(d) iron.
Answer: (a) calcium reacts with oxygen to give calcium oxide which is dissolved in water to give lime water.