Q21: Metal X burns with a dazzling white flame in air to form a compound
Y. (a) Identify the X and Y. (b) Write the word equation involved in forming
compound Y by reaction X and air.
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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), O
2
d) Substance Z is Magnesium hydroxide Mg(OH)
2
. Used as an antacid to relieve indigestion.
e) 2Mg+O
2
→2MgO
powder
Explanation:
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