9701 Chemistry CIE AS level mcqs > May Jun 2019 Paper 11 ▼
12 1.15g of a metallic element needs 300 cm³ of oxygen for complete reaction, under room
conditions, to form an oxide which contains O²- ions.
What could be the identity of this metallic element?
A calcium
B magnesium
C potassium
D sodium

Oxygen gas is the product in the reaction between calcium and oxygen to form calcium oxide, represented by the chemical equation 2 Ca + O2 → 2 CaO. This reaction is a classic example of how metals in the same group react similarly with oxygen.

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9701 Chemistry CIE AS level mcqs > May Jun 2019 Paper 11 ▼12 1.15g of a metallic element needs 300 cm³ of oxygen for complete reaction, under roomconditions, to form an oxide which contains O²- ions.What could be the identity of this metallic element?A calciumB magnesiumC potassiumD sodium

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