A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Oct/Nov 2018 · Q61 Mark

Exactly 1.00 g of a metallic element reacts completely with 300 cm³ of oxygen at 298 K and 1 atm pressure to form an oxide which contains O²⁻ ions. The volume of one mole of gas at this temperature and pressure is 24.0 dm³. What could be the identity of the metal?

Acalcium

Bmagnesium

Cpotassium

Dsodium

✓ Correct answer

A: calcium

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Topic: Atoms, molecules and stoichiometry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 2, question 6.

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