Question

A metal ribbon X when ignited burns with a bright light and forms a white powder Y. The
powder on dissolution in water forms a product Z .This product Z changes the colour of
itmus paper.
i) Identify X,Y,Z.
ii) What happens when product Z is Treated with red litmus paper .Give reason for the
observation.
iii) Write balanced chemical equations involved in the formation of Z.

Answer 1

Explanation:

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

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