CBSE NEET Chemistry Practice MCQs 2 ( Chapter- Basic Concepts of Chemistry) of 11th Class

This are MCQs of Chapter 1 (Basic Concepts of Chemistry) for 11th Class. Practic MCQs to check your knowledge for Entracne examination like CBSE NEET etc

1. Substances which CANNOT be decomposed into two or more different substances by chemical process are called _______.

• alloys
• molecules
• elements
• compounds

2. The arbitrarily decided and universally accepted standards are called _______.

• fundamentals
• units
• measures
• symbols

3. There are _______ fundamental SI units.

• 3
• 5
• 6
• 7

4. SI unit of temperature is _______.

• K
• ⁰C
• ⁰F
• D

5. SI unit of velocity is _______.

• km s^-1
• km hr^-1
• m s^-2
• m s^-1

6. The sum of the masses of reactants and products is equal in any physical or chemical reaction. This is in accordance with law of _______.

• multiple proportion
• definite composition
• conservation of mass
• reciprocal proportion

7. If the law of conservation of mass was to hold true, then 20.8 g of BaCl₂, on reaction with 9.8 g of H₂SO₄ will produce 7.3 g of HCl and _______ of BaSO₄.

• 11.65 g
• 23.3 g
• 25.5 g
• 30.6 g

8. Pure water can be obtained from various sources, but it always contains hydrogen and oxygen, combined in a ratio of 1:8 by weight. This is an example of _______.

• law of conservation of mass
• Avogadro's law
• law of definite composition
• Gay Lussac's law

9. Two containers of the same size are filled separately with H₂ gas and CO₂ gas. Both the containers under the same T and P will contain the same _______.

• number of atoms
• weight of gas
• number of molecules
• number of electrons

10. In SO₂ and SO₃, the ratio of the masses of oxygen which combine with a fixed mass of sulphur is 2:3. This is an example of the law of _______.

• constant proportion
• multiple proportion
• reciprocal proportion
• Gay Lussac

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