Question

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

Options

• 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

Answer 1

X = Mg; Y = MgO;

Type of reaction = Combination

Explanation:

In this reaction, magnesium and oxygen combine to create magnesium oxide.

\[\ce{2Mg + O_2 ->2MgO}\]