chemical-reactions-and-equations class 10 MCQ

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Multiple choice question CHEMISTRY X Chemical Reaction and Equations

1. Respiration is:

(a) Endothermic reaction

(b)Exothermic reaction

(d) None

2. Photolysis is:

(a) Decomposition

(b) Addition

(d) Oxidation

3. Fe2O3 + 3CO → 2Fe + 3CO2, which is reducing agent in the above reacton:

(a) Fe2O3

(b) CO

(c) Fe

(d) CO2

4. What are the conditions for rusting of an iron article:

(a) Presence of air

(b) Presence of moisture

(c) Both

(d) None

5. Plaster of Paris is

(a) 2CaSO4.H2O

(b) CaSO41/2H2O

(c) Both

(d) None

6. Oxidation reaction is a chemical process in which a substance:

(a) Gains hydrogen

(b) Gains oxygen

7. Hydration means:

a) addition of hydrogen

(b) addition of hydrogen chloride

(c) addition of sulphuric acid

(d) addition of water

8.The decomposition of CaCO3 is

(a) an endothermic reaction

(b) an exothermic reaction

(c) an photolysis reaction

(d) None

9. Hydrogenation means :

(a) addition of hydrogen

(b) addition of hydrogen chloride

(c) addition of sulphuric acid

(d) addition of water

10 Al(OH)3 + HCl → AlCl3 + _______

(a) H2O

(b) H2

(c) AlCl3

(d) None

11. A solution of substance X is used for white washing. What is X:

(a) CaO

(b) Ca(OH)2

(c) CaCO3

(d) CaCl2

12. What happens when dil HCl is added to iron filing:

(a) Hydrogen gas and iron chloride are produced

(b) Cl2 gas and Iron hydroxide are produced

(c) No reaction takes place

(d)Iron salt and water is produced

13. Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a:

(a) Combination reaction

(b) Double displacement reaction

(c) Decomposition reaction

(d) displacement reaction

14. Nitrogen gas is used by chips manufacturer since:

(a) Nitrogen is an oxidizing agent

(b) Nitrogen gas is a reducing agent

(c) Nitrogen is an antioxidant

(d) None.

15. AB + CD → AD + CB

The above reaction is an example of

(a) Displacement

(b) Double displacement

(c) combination

(d) oxidation

16. Which of the following are the characteristics of a chemical reaction:

(a) Evolution of gas

(b) formation of precipitate

(c) change in color

(d) all

17. CH4 + O2 → CO2 + ________

(a) Hydrogen

(b) water

(c) CO

(d) none

18. A balance chemical equation has :

(a) an equal number of atom

(b) an equal number of mass

(c) an equal number of protons

(d) an equal number of electrons

19 In chemical reaction:

(a) only electron takes part

(b) only protons take part

(c) only neutrons take part

(d) none

20. Na is placed in kerosene oil since:

(a) Na is soft

(b) Na is highly inflammable

(c) Na is metal

(d) none

21. The properties of product in a chemical reaction is

(a) same as that of reactant

(b) different as that of reactant

(c) Both

(d) none

22. Rust is chemically defined as:

(a) Fe2O3.xH2O

(b) Fe3O4.xH2O

(c) Fe2O3.2H2O

(d) Fe3O4.xH2O

23 Food items can be preserved for longer time when kept in a refrigerator since:

(a) The reduction process starts in refrigerator

(b) the oxidation process starts in refrigerator

(c) At lower temperature oxidation process gets slowed

(d) None

24. When sodium reacts with Cl2, the molecular formula of product in Balance equation is

(a) 2NaCl

(b) NaCl

(c) 3NaCl

(d) NaCl2

25. we apply paint on iron article to

(a) Prevent from corrosion

(b) improve the hardness

(c) make it attractive

(d) None

Answer:

1	(a) Endothermic reaction
2	(a) Decomposition
3	(b) CO
4	(c) Both
5	(c) Both
6	(b) Gains oxygen
7	(d) addition of water
8	(a) an endothermic reaction
9	(a) addition of hydrogen
10	(a) H₂O
11	(a) CaO
12	(a) Hydrogen gas and iron chloride are produced
13	(d) displacement reaction

14	(c) Nitrogen is an antioxidant
15	(b) Double displacement
16	(d) all
17	(b) water
18	(a) an equal number of atom
19	(a) only electron takes part
20	(b) Na is highly inflammable
21	(b) different as that of reactant
22	(a) Fe₂O₃.xH₂O
23	(c) At lower temperature oxidation process gets slowed
24	(a) 2NaCl
25	(a) Prevent from corrosion

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