Element X is a metal. X reacts with oxygen to form a black solid oxide. The oxidation state of
X in this oxide is +2. The carbonate of X, XCO3, is a green solid. It decomposes on heating to
form the oxide and a colourless gas.
(i) From the information given, state two similarities and one difference that metal X and its
compounds have with Group 2 metals and their compounds.
similarity 1 ............................................................................................................................
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similarity 2 ............................................................................................................................
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difference 1 ..........................................................................................................................