question_answer 60)

  A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.            

Answer:

  X is calcium oxide (CaO), also called quick lime. It reacts with water to form calcium, hydroxide which is a basic compound.