Chemical Reactions and Equations MCQ
1. The process of reduction involves_________
(1) addition of oxygen
(2) addition of hydrogen
(3) removal of oxygen
(4) removal of hydrogen
Answer: 2
2. A substance added to food containing fats and oils is called________
(1) Oxidant
(2) Rancid
(3) Coolant
(4) Antioxidant
Answer: 4
3. Oxidation is a process which involves in the_________
(1) addition of oxygen
(2) addition of hydrogen
(3) removal of oxygen
(4) removal of hydrogen
Answer: 1
4. Which of the following is an endothermic process?
(1) Dilution of sulphuric acid
(2) Sublimation of dry ice
(3) Condensation of water vapours
(4) Respiration in human beings
Answer: 2
5. The chemical formula of magnesium oxide is?
(a) MgO2
(b) Mg2O
(c) MgO
(d) Mg(OH)2
Answer: 3
6. What type of chemical reactions take place when electricity is passed through water?
(1) Displacement
(2) Combination
(3) Decomposition
(4) Double displacement
Answer: 3
7. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
(1) 1 : 1
(2) 2:1
(3) 4:1
(4) 1:2
Answer: 2
8. The substitution is characteristic of____________
(1) Alkenes
(2) Alkynes
(3) Carbon monoxide
(4) Paraffins.
Answer: 4
9. What type of reaction is respiration_________
(1) Exothermic
(2) Endothermic
(3) Reduction reaction
(4) Combination reaction
Answer: 1
10. 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)
(1) (i) and (ii)
(2) (ii) and (iii)
(3) (i) and (iv)
(4) (iii) and (iv)
Answer: 1
11. Rancidity can be prevented by_______
(1) adding antioxidants
(2) storing food away from light
(3) keeping food in refrigerator
(4) all of these
Answer: 4
12. The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of
(1) Decomposition Reaction
(2) Displacement Reaction
(3) Double Displacement Reaction
(4) Neutralisation Reaction
Answer: 3
13. Which of the following reactions can also be termed as thermal decomposition reaction?
(1) Combination Reaction
(2) Decomposition Reaction
(3) Displacement reaction
(4) Double displacement reaction
Answer: 2