If there is one million Mg2+ ions in MgCl2, how many chloride

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If there is one million Mg₂+ ions in MgCl_{2_{, how many chloride ions are there?}}

1. Two million
2. One million
3. Half a million
4. Ten million

Correct Option: A

Using formula of Stoichiometry, 1mol MgCl₂ : 1mol Mg₂+: 2mol Cl-. There are two moles of chloride ions for every one mole of MgCl₂. So if there is one million Mg₂+ ions in MgCl₂, there will be two million chloride ions in it