CBSE Class 10 Science 2023 Delhi Set 1

Question : 3

Total: 39

A metal ribbon ' X ' burns in oxygen with a dazzling white flame forming a white ash ' Y '. The correct description of X,Y and the type of reaction is:

X=Ca; Y=CaO;
Type of reaction = Decomposition
X=Mg;Y=MgO;
Type of reaction = Combination
X=Al;Y=Al2O3;
Type of reaction = Thermal decomposition
X=Zn;Y=ZnO
Type of reaction = Endothermic

Solution:

Explanation: In this reaction magnesium combines with oxygen to form magnesium oxide.
2‌Mg+O2→2‌MgO

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