Laws of Chemical Combination, Class 11 Chemistry NCERT Solutions

1. There will be total 15  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. Which law is also known as Law of constant composition?

  Law of multiple proportions

 Avogadro’s law

 Law of conservation of mass

 Law of definite proportions

Question 1 of 15

2. According to Dalton’s atomic theory chemical reactions involve:

  destruction of atoms

 reorganisation of nuclei

 reorganisation of atoms

 construction of atoms

Question 2 of 15

3. 100mL of gaseous hydrogen combines with 50mL of gaseous oxygen to give 100mL of water vapours. This can be explained on the basis of:

  Law of definite proportions

 Gay Lussac’s law

 Law of multiple proportions

 Avogadro law

Question 3 of 15

4. According to the Avogadro’s law, equal volumes of gases at the same temperature and pressure should contain:

  Same potential energy

 Same molartity

 Equal number of molecules

  Same kinetic energy

Question 4 of 15

5. The distinction between atoms and molecules was made by:

  Dalton’s atomic theory

 Avogadro law

 Laws of chemical combination

 Gay lussacs law

Question 5 of 15

6. Law of definite proportions is given by:

  Antoine Lavoisier

 Joseph Proust

 Avogadro

 John Dalton

Question 6 of 15

7. According to Avogadro’s law at the same temperature and pressure:

 Equal volumes of gases contain equal number of molecules.

 Matter can neither be created nor destroyed.

 Compounds are formed when atoms of different elements combine in a fixed ratio.

 Matter consists of indivisible atoms.

Question 7 of 15

8. Law of constant composition does not hold good for:

  Endothermic compounds

 Non-stoichiometric compounds

 Stoichiometric compounds

 Exothermic compounds

Question 8 of 15

9. Laws of chemical combinations can be explained on the basis of:

  Avogadro law

 Gay lussacs law

 Dalton’s atomic theory

 Mole concept

Question 9 of 15

10. What is incorrect about the Law of conservation of mass?

  A given compound always conatains exactly the same proportion of elements by weight

 Mass of reactants is equal to the mass of products

 Matter can neither be created nor destroyed

 It was given by Antoine Lavoiser

Question 10 of 15

11. A statement which is not a part of Dalton’s atomic theory is:

 Matter is made of atoms.

 All atoms of a given element are identical.

 Atoms are composed of sub-atomic particles called electron, proton and neutron.

 Atoms of different elements have different mass and different properties.

Question 11 of 15

12. Natural sample of cupric carbonate contains 51.35% of copper, 9.74% of oxygen and 38.91% of carbon. Synthetic sample of the compound will contain:

  51.35% of copper, 19.74% of oxygen and 30.91% of carbon.

 51.35% of Copper, 9.74% of oxygen and 38.91% of carbon

 9.74% of copper, 38.91% of oxygen and 9.74% of carbon

 9.74% copper, 9.74% of oxygen and 38.91% of carbon

Question 12 of 15

13. A compound prepared by any method contains the same elements in the fixed ratio by mass. The given statement is known as:

  Law of definite Proportions

 Law of reciprocal Proportions

 Law of conservation of mass

 Law of multiple Proportions

Question 13 of 15

14. At what conditions Gay Lussac’s law of gaseous volumes is considered?

  Same pressure only

 Same temperature only

 Same amount of all the reactants and products only.

 Same temperature and pressure.

Question 14 of 15

15. Law of conservation of mass was given by:

  Avogadro

  Antoine Lavoisier

 John Dalton

 Joseph Proust

Question 15 of 15

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