Chemical reactions and equations MCQ

Chemical reactions and equations MCQ/objective questions Class 10 Science Chapter 1

1. Magnesium ribbon is cleaned before burning. Why?

A. It absorbs moisture from the atmosphere which interferes with burning.

B. It’s outer layer form oxides which interfere with burning.

C. Dust from the atmosphere prevents its burning.

D. All of the above

1(B)
2. Balanced equation of  Fe + H2O ———–> Fe3O+ His

A. Fe + 4H2O ———–> Fe3O+ H2

B. Fe + 4H2O ———–> Fe3O+ 4H2

C. 3Fe + 4H2O ———–> Fe3O+ 4H2

D. 3Fe(s) + 4H2O(l) ———–> Fe3O4(s) + 4H2(g)

2(D)
3. What is the formula of quick lime. What does it form when put into water.

A. CaO, CaCO3

B. CaO, Ca(OH)2

C. Ca(OH)2, CaCO3

D. None

3(B)
4. A compound used for whitewashing is

A. Quick lime

B. Slaked Lime

C. Blue vitriol

D. Limestone

4(B)
5. Electrolysis of water is

A. Combination reaction

B. Decomposition reaction

C. Displacement reaction

D. None

5(B)
6. Example of displacement reaction is

A. Fe(s) + CuSO4(aq)  ——>  FeSO4(aq) + Cu(s)

B. C(s) + O2(g)  ——–> CO2(g)

Sunlight

C. AgCl(s)  ———> 2Ag(s) + Cl2(g)

D. None

 6(A)
7. Lead nitrate Pb(NO3)2 on heating forms Lead oxide (PbO) solid and Nitrogen dioxide gas. What is the colour of lead oxide and nitrogen dioxide?

A. White, Colourless

B. White, Brown

C. Yellow, Brown

D. Yellow, Colourless

 7(C)

8. Silver chloride on exposure to sunlight decomposes into silver and chlorine gas. This property is used in

A. Heat production as enormous energy is released.

B. Silver extraction as earth contains silver mainly in silver chloride form.

C. Photography as formed grey silver form an image imprint.

D. None

 8(C)
9. Quick lime is used in whitewashing because

A. It is cheap

B. It forms slaked lime with water which has a nice colour.

C. It forms slaked lime with water which reacts with atmospheric carbon dioxide to form limestone.

D. None

9(C)
10. Example of a double displacement reaction will be

A. Metal with a salt

B. Metal with an acid

C. Metal with metal

D.  Salt with a salt

10(D)
11. A reaction of hydrogen with oxygen to form water is a

A. Endothermic reaction

B. Exothermic reaction

C. Decomposition reaction

D. Reaction not feasible

11(B)
12. Ferrous sulfate solution is green while ferric oxide formed by its decomposition is

A. Red

B. White

C. Brown

D. Yellow

12(C)
13. Corrosion or rusting of iron metal is

A. Oxidation of iron

B. Reduction of iron

C. Displacement of iron

D. None

1(B), 2(D), 3(B), 4(B), 5(B), 6(A), 7(C), 8(C), 9(C), 10(D), 11(B), 12(C), 13(C), 14(B), 15(C),16(B), 17(D), 18(B)

14. Rancidity of fat or oil is:

A. Degradation by microorganism

B. Oxidation of fat

C. Reduction of fat

D. None

14(B)
15. To facilitate the electrolysis of water we add a few drops of acids like sulfuric acid or salts like NaCl. Because:

A. It acts as a catalyst

B. It prevents the decomposition of electrodes used.

C. It increases the electrical conductivity of water.

D. None

15(C
16. Food manufacture pack fried foods with which gas to prevent oxidation of fat?

A. Oxygen

B. Nitrogen

C. Any of the above

D. None

16(B)
17. The oxidation reaction is:

A. Addition of oxygen atom

B. Removal of the hydrogen atom

C. Loss of electron

D. All

17(D)
18. The blue flame in the below image represent burning of which metal?

Chemical reactions and equations MCQ

A. Iron

B. Copper

C. Sodium

D. All metal burn to give a blue flame.

18(B)

Answers to MCQ’s: 1(B), 2(D), 3(B), 4(B), 5(B), 6(A), 7(C), 8(C), 9(C), 10(D), 11(B), 12(C), 13(C), 14(B), 15(C),16(B), 17(D), 18(B).

Next: Solved questions from Chemical Reactions and Equations.

See also:

Model questions for chapter 1.

 

Chemical reactions and equations MCQ/objective questions Class 10 Science Chapter 1

 

Download:

Ncert class 10 science chapter 1 Chemical Reaction and Equations MCQ PDF

 

Ref: Ncert books.

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