CBSE Class 10 Science 2023 Delhi Set 1

Question : 3 of 39

Marks: +1, -0

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
${\X}= {\Al} ; {\Y}= {\Al}_2 {\O}_3$ ;
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.

2 {\Mg}+ {\O}_2 → 2 {\MgO}

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