Q. 503.6( 8 Votes )

A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y. When water is added to powder Y, it dissolves partially to form another substances. (a) What could metal X be?
(b) What is powder Y?
(c) With which substance metal X combines to form powder Y?
(d) What is substance Z? Name one domestic use of substance Z.
(e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.

Answer :

(a) Metal X is Magnesium, Mg.

(b) Powder Y is Magnesium oxide, MgO.

(c) Metal X combines with Oxygen to form powder Y

(d) Substance Z is Magnesium hydroxide, Mg(OH)2; Used as antacid to relieve indigestion.

(e) 2Mg + O2 2MgO

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