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Class 11 Chemistry Practice Test: Basic Concepts of Chemistry - Percentage Composition
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Avg score: 55% • Most missed: “In glucose simplest ratio between C, H and O is ________”

The percentage composition of any given compound is the ratio of the amount of each element present in the compound to the total amount of individual elements present in the compound multiplied by 100.

Class 11 Chemistry Practice Test: Basic Concepts of Chemistry - Percentage Composition
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10 Questions

1. A compound consists of 52.17% of carbon, 13.04% of hydrogen and 34.78% of oxygen. Find the molecular formula if the given molecular weight of the compound is 46g.
2. A _______ formula represents a whole number ratio to the simplest form.
3. Which of the following cannot be a molecular formula for an empirical formula HO?
4. __________ formula can be calculated if the molar mass is known after having an empirical formula.
5. Which of the following is true regarding molecular formula?
6. Which of the following is an empirical formula?
7. The molecular formula of a compound is C6H12O6. What’s the empirical formula for this compound?
8. In glucose simplest ratio between C, H and O is ________
9. Even without knowing the mass percent of each element, we can calculate the empirical formula.
10. Which of the following cannot be an empirical formula?

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