Chemical Reaction and Equation Class 10 MCQ
Here is Some multiple choice questions on Chemistry from Chemical Reaction and Equation Class 10 MCQ . This is most important for not only the matric level but also 12th level also.
Science MCQ
1.The reaction of formation of aluminium chloride from aluminium and chlorine. Which options give the chemical equation of the reaction?
(a) Al2 +2 Cl2 →2 AlCl2
(b) 2Al +2 Cl2 → Al2Cl2
(c) 2Al + 3Cl2 → 2AlCl3
(d) 3Al + 6Cl→ 3AlCl3
Answer: (c) 2Al + 3Cl2 → 2AlCl3
2. Which of the following is not involve a chemical reaction, that is:
(a) Melting of candle wax when heated
(b) Burning of candle wax when heated
(c) Digestion of food in your stomach
(d) Ripening of banana
Answer: (a) Melting of candle wax when heated
3. The chemical formula of chromium oxide is?
(a) CrO2
(b) Cr2O
(c) Cr2O3
(d) Cr(OH)2
Answer: (c) Cr2O3
4. Relates to oxidation reaction?
(a) Gain of electron
(b) Loss of electron
(c) Gain of hydrogen
(d) None of the above
Answer : (b) Loss of electron
5. The rubbed Magnesium ribbon is burn as it has
(a) basic magnesium carbonate
(b) basic magnesium oxide
(c) basic magnesium sulphide
(d) basic magnesium chloride
Answer: (a) basic magnesium carbonate
6. The correct statements are
3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
(a) (i), (zi) and (iii)
(b) (in) and (iv)
(c) (i), (ii) and (iv)
(d) (ii) and (iv)
Answer (c) (i), (ii) and (iv)
7. Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Answer (a) (i) and (ii)
8. Oxidation is a process which involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen
Answer (a) addition of oxygen
9. The process of reduction involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen
Answer (b) addition of hydrogen
10. Give the ratio in which hydrogen and oxygen are present in water by volume.
(a) 1:2
(b) 1:1
(c) 2:1
(d) 1:8
Answer (a) 1:2
11. MnO2 + 4HCl → 2 + 2H2O + Cl2
The oxidised subsstance is
(a) MnCl2
(b) HCl
(c) H2O
(d) MnO2
Answer (d) MnO2
12.A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.
(a) CaOCl2
(b) Ca (OH)2
(c) CaO
(d) CaCO3
Answer (a) CaOCl2
13. When Ag is exposed to air it results
(a) AgNO3
(b) Ag2S
(c) Ag2O
(d) Ag2CO3
Answer (b) Ag2S
14. Example of an endothermic process is
(a) Dilution of sulphuric acid
(b) Sublimation of dry ice
(c) Condensation of water vapours
(d) Respiration in human beings
Answer (b) Sublimation of dry ice
15. The reaction involved electricity is passed through water is an example of
(a) Displacement
(b) Combination
(c) Decomposition
(d) Double displacement
Answer (c) Decomposition
