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MCQ Laws of Chemical Combination Chapter 3 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 24 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. A student heats 25g of reactant 'A' with 50g of reactant 'B'. He obtains 50g of product 'C' and recovers 25 g of unreacted 'B'. Which of the following law is confirmed in the following reaction?

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Question 1 of 24

2. Law of conservation of mass can be derived from which postulate of Dalton's atomic theory?

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Question 2 of 24

3. 5 grams of compound A reacts with 10 grams of compound B to produce a new compound C. What should be the mass of C according to law of conservation of mass?

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Question 3 of 24

4. According to Law of conservation of mass, mass of reactants wil be equal to the mass of:

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Question 4 of 24

5. The reaction used in the experiment to verify the law of conservation of masses is included in which of the following categories?

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Question 5 of 24

6. The atomic masses and chemical properties of Sulphur and Phosphorus are different. This can be explained on the basis of:

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Question 6 of 24

7. When CaCO3 is heated, it forms CaO and CO2. Which of these statements best describes the mass of the products if 100 g of CaCO3 is heated?

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Question 7 of 24

8. According to the law of conservation of mass, 3 g of carbon burnt in 8 g of oxygen forms 11 g of carbon dioxide. Now, what will be the mass of carbon dioxide produced when 3 g of carbon is burnt in 50 g of oxgyen?

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Question 8 of 24

9. Which of the following statements is true about the law of conservation of mass?

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Question 9 of 24

10. Which of the following statements is true about ‘Law of conservation of mass"?

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Question 10 of 24

11. Who gave the Law of constant proportions?

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Question 11 of 24

12. Which of the following statement is not in accordance with Dalton's atomic theory?

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Question 12 of 24

13. Which of the following is the major drawback of Dalton's atomic theory?

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Question 13 of 24

14. Which of the following is correct for the 'Law of Conservation of Mass'?

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Question 14 of 24

15. The balancing of chemical equation is based upon:

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Question 15 of 24

16. Which of the following is not a postulate of Dalton's atomic theory?

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Question 16 of 24

17. Which type of reaction is being used in the experiment of verifying the law of conservation of mass?

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Question 17 of 24

18. 9 grams of water decompose to give:

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Question 18 of 24

19. Who stated the Law of conservation of mass?

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Question 19 of 24

20. If all the reactants in a chemical reaction are completely used, which of the following statements accurately describes the relationship between the reactants and the products?

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Question 20 of 24

21. Assertion : The valency of aluminium is 3 and oxygen is 2.
Reason : The chemical formula of aluminium oxide is Al3O2.

Question 21 of 24

22. Assertion : A molecule is the smallest particle of an element or a compound which is capable of free existence.
Reason : The number of atoms present in one molecule of the substance is called its atomicity.

Question 22 of 24

23. Assertion: Water molecules always contain hydrogen and oxygen in the ratio 1:8.
Reason: Water obeys law of constant proportions irrespective of source and method of preparation.

Question 23 of 24

24. Assertion : Ions are always positively charged.
Reason : Ions are formed by losing or gaining electrons.

Question 24 of 24

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