question_answer 35)

    Which one of the following metals do not react with cold as well as hot water? (a) Na                                    (b) Ca                                    (c) Mg                                   (d) Fe

Answer:

                  (d) Some metals like (Na, K and Ca) react with cold water. Mg metal reacts with hot water but Zn and Fe react with steam. Metals like lead, copper, silver and gold do not react with water (or even steam). Red hot iron reacts with steam to form iron (II, III) oxide and hydrogen.