Class 10

Chemical Reactions and Equations | Quiz 1

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1. Why should a magnesium ribbon be rubbed with sandpaper before burning?

 
 
 
 

2. When magnesium ribbon burns, what is the color of the flame?

 
 
 
 

3. Which observation helps us determine if a chemical reaction has occurred?

 
 
 
 

4. A chemical equation that is not yet balanced is called a:

 
 
 
 

5. Balancing of chemical equations is based on which law?

 
 
 
 

6. The symbol (aq) used in a chemical equation represents:

 
 
 
 

7. What is the common name of Calcium Oxide (CaO)?

 
 
 
 

8. Reactions in which heat is released are called:

 
 
 
 

9. Respiration is classified as which type of reaction?

 
 
 
 

10. Decomposition of vegetable matter into compost is:

 
 
 
 

11. What is the color of Ferrous Sulphate crystals?

 
 
 
 

12. What odor is observed when Ferrous Sulphate is heated?

 
 
 
 

13. Heating of Lead Nitrate produces brown fumes of:

 
 
 
 

14. Which gas is released during the electrolysis of water at the cathode?

 
 
 
 

15. What happens to the color of Silver Chloride in sunlight?

 
 
 
 

16. Reactions used in black and white photography involve:

 
 
 
 

17. When energy is absorbed during a reaction, it is called:

 
 
 
 

18. What is the color of the precipitate formed by adding Potassium Iodide to Lead Nitrate?

 
 
 
 

19. The reaction where one element takes the place of another in a compound is:

 
 
 
 

20. In the reaction of Iron with Copper Sulphate, the solution turns:

 
 
 
 

Question 1 of 20

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