Some Basic Concepts of Chemistry Quiz - CBSE Class 11 Science

Free practice quiz: Some Basic Concepts of Chemistry (CBSE Class 11 Science). 44 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the SI unit of molar mass?

   1. kg
   2. g/mol
   3. mol
   4. kg/mol
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   Answer: D. kg/mol

   Molar mass is the mass of one mole of a substance, and the SI unit of mass is kg. Therefore, the SI unit of molar mass is kg/mol.

2. Describe the process of stoichiometric calculations.

   1. Calculations involving the mass of reactants and products in a chemical reaction.
   2. Calculations involving the volume of reactants and products in a chemical reaction.
   3. Calculations involving the rate of chemical reactions.
   4. Calculations involving the temperature of chemical reactions.
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   Answer: A. Calculations involving the mass of reactants and products in a chemical reaction.

   Stoichiometric calculations use the balanced chemical equation to relate the amounts of reactants and products.

3. Explain the concept of molar volume of a gas.

   1. The volume occupied by one mole of a gas at STP.
   2. The volume occupied by one gram of a gas at STP.
   3. The volume occupied by one kilogram of a gas at STP.
   4. The volume occupied by any amount of gas at STP.
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   Answer: A. The volume occupied by one mole of a gas at STP.

   At standard temperature and pressure (STP), one mole of any ideal gas occupies a volume of approximately 22.4 liters.

4. Explain the concept of an empirical formula.

   1. The simplest whole-number ratio of atoms of each element in a compound.
   2. The actual number of atoms of each element in a molecule.
   3. The formula that shows the arrangement of atoms in a molecule.
   4. The formula that shows only the metallic elements in a compound.
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   Answer: A. The simplest whole-number ratio of atoms of each element in a compound.

   The empirical formula represents the simplest whole-number ratio of atoms of different elements present in a compound.

5. Explain the difference between a pure substance and a mixture.

   1. A pure substance has a fixed composition, while a mixture does not.
   2. A pure substance has a variable composition, while a mixture does not.
   3. Pure substances and mixtures are the same.
   4. Pure substances are always solids, mixtures are always liquids.
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   Answer: A. A pure substance has a fixed composition, while a mixture does not.

   A pure substance has a definite and constant composition, while a mixture is a combination of two or more substances.

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