Question

A silvery white metal X is in the form of ribbons. Upon ignition, it burns with a dazzling white flame to form white powder Y. When water is added to the powder Y, it partially dissolves to form a substance Z which is used as an antacid. (a) What is metal X ?
(b) Name the white powder Y.
(c) What is the substance Z ?
(d) Write the chemical reactions that are taking place.​

Answer 1

Answer:

a) Metal X is Magnesium (Mg).

b) Powder Y is Magnesium oxide, (MgO).

c) The substance with which metal X combines to form powder Y is Oxygen (of air), O2

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

e) 2Mg+O2→2MgO

                               powder