Question

An element reacts with oxygen to give a compound with high melting point This compound is also soluble in water this element is likely to be
A) carbon B)calcium C)silicon D)iron

Answer 1

The answer is B)calcium

Answer 2

Answer:

Correct answer is option (a) i.e Calcium.

Calcium reacts with oxygen to give calcium oxide. Calcium oxide is soluble in water to give Calcium Hydroxide.

Carbon forms carbon-oxide with oxygen which is gas hence option B is wrong

Silicon reacts with oxygen and forms silicon dioxide. This is insoluble in water. So option C is not correct.

Iron reacts with oxygen and forms Iron dioxide. This is insoluble in water. So option D is not correct