What will be the ratio of magnesium atoms to oxygen atoms in five formula units of magnesium oxide?
Answer and explanation
Correct answer: One to one
The formula of magnesium oxide is MgO. It contains one magnesium atom and one oxygen atom per formula unit, so the Mg:O ratio is 1:1. Five formula units contain five magnesium atoms and five oxygen atoms; simplifying 5:5 gives 1:1. Therefore option A is correct. The number five increases both quantities equally, so it does not change the ratio. Options B and C count only one element correctly, while D does not follow the formula.
Frequently asked questions
What is the correct answer to this question?
One to one
Why is this the correct answer?
The formula of magnesium oxide is MgO. It contains one magnesium atom and one oxygen atom per formula unit, so the Mg:O ratio is 1:1. Five formula units contain five magnesium atoms and five oxygen atoms; simplifying 5:5 gives 1:1. Therefore option A is correct. The number five increases both quantities equally, so it does not change the ratio. Options B and C count only one element correctly, while D does not follow the formula.
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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