In two formula units of magnesium oxide, what is the ratio of magnesium atoms to oxygen atoms?
Answer and explanation
Correct answer: \(1:1\)
The formula of magnesium oxide is \(\mathrm{MgO}\), so each formula unit contains 1 magnesium atom and 1 oxygen atom. Two formula units therefore contain 2 magnesium atoms and 2 oxygen atoms. Thus, the ratio is \(2:2=1:1\). A ratio of \(2:1\) would incorrectly give fewer oxygen atoms than required.
Frequently asked questions
What is the correct answer to this question?
\(1:1\)
Why is this the correct answer?
The formula of magnesium oxide is \(\mathrm{MgO}\), so each formula unit contains 1 magnesium atom and 1 oxygen atom. Two formula units therefore contain 2 magnesium atoms and 2 oxygen atoms. Thus, the ratio is \(2:2=1:1\). A ratio of \(2:1\) would incorrectly give fewer oxygen atoms than required.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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