10th Science Chap 1 Chemical Reactions and Equations

Welcome to your 10th Science Chap 1 Chemical Reactions and Equations

1. 
Which of the following is a chemical change?

2. 
What type of reaction is this? CaO + H₂O → Ca(OH)₂

3. 
Which gas is released when zinc reacts with dilute HCl?

4. 
What is the balanced equation for burning magnesium?

5. 
Which of the following is an exothermic reaction

6. 
What is oxidation?

7. 
Which substance is reduced in the reaction? CuO + H₂ → Cu + H₂O

8. 
Which type of reaction is this? Fe + CuSO₄ → FeSO₄ + Cu

9. 
What is corrosion?

10. 
Which gas is collected at cathode during electrolysis of water?

11. 
What is the ratio of hydrogen and oxygen in electrolysis of water?

12. 
Which reaction is photochemical?

13. 
What is rancidity?

14. 
Which method prevents rancidity?

15. 
Which is a double displacement reaction?

16. 
Balanced equation means:

17. 
AB → A + B is:

18. 
Decomposition by electricity is called:

19. 
CaCO₃ → CaO + CO₂ is:

20. 
in a taste tube A containing solution of barium chloride and taste tube B containing solution of sodium sulphate. Identify the product which represents the solid state in the above reaction

21. 
reema took 5 ml of lead nitrate solution in a beaker and added approximately 4 ml of pottasium iodide solution to it . What would she observe?

22. 
A student took sodium sulphate solution in a test tube and added barium chloride solution to it. He observed that an insoluble substance has formed. The colour and molecular formula of the insoluble substance is:

23. 
The chemical reaction between copper and oxygen can be categorized as:

24. 
When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separate out. The chemical equation for the reaction involved in

25. 
The balanced chemical equation showing reaction between quicklime and water is

26. 
metal ribbon X burns in oxygen with a dazzling white flame, forming a white ash Y. The correct description of X, Y and the type of reaction are

27. 
Which of the following reactions is different from the remaining three ?

28. 
Reema took 5ml of lead nitrate solution in a beaker and added approximately 4ml of Potassium iodide solution to it. What would she observe ?

29. 
Which of the following is a necessary condition for all chemical reactions ?

30. 
On placing a copper coin in a test tube containing green ferrous sulphate solution, it will be observed that the ferrous sulphate solution

31. 
Which among the following is/are true about slaking of lime and the solution of lime water formed ?

32. 
Identify the oxidizing agent: CuO + H₂ → Cu + H₂O

33. 
Which reaction is endothermic?

34. 
What is the colour of CuSO₄ solution?

35. 
Which metal displaces copper from CuSO₄?

36. 
Reduction involves:

37. 
Electrolysis of water gives

38. 
Which is a photochemical decomposition reaction?

39. 
Which gas is evolved when acid reacts with carbonate?

40. 
Which of the following best explains rancidity?