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MCQs from CBSE Class 10 Science Chapter 1: Chemical Reactions and Equations

MCQs:
1. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:
 a. Make the ribbon surface shinier
 b. Remove the layer of magnesium oxide from the ribbon surface
 c. Remove the layer of magnesium carbonate from the ribbon surface
 d. Remove the moisture from the ribbon surface 
Answer. c. Remove the layer of magnesium carbonate from the ribbon surface.
2. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:
 a. Hydrochloric acid
 b. Barium sulphate
 c. Chlorine
 d. Sulphur
Answer. b. Barium sulphate
3. The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy is a kind of:
 a. Exothermic process.
 b. Endothermic process.
 c. Reversible process.
 d. Physical process
Answer. a. Exothermic process
4. A chemical reaction does not involve:
 a. Formation of new substances having entirely different properties than that of the reactants
 b. Breaking of old chemical bonds and formation of new chemical bonds.
 c. Rearrangement of the atoms of reactants to form new products.
 d. Changing of the atoms of on element into those of another element to form new  products
Answer. d. Changing of the atoms of on element into those of another element to form new  products
5. One of the following processes does 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 our stomach.
 d. Ripening of banana
Answer. a. Melting of candle wax when heated
6. It is necessary to balance a chemical equation in order to satisfy the law of:
 a. Conservation of motion
 b. Conservation of momentum
 c. Conservation of energy
 d. Conservation of mass
Answer. d. Conservation of mass
7. All the methods mentioned below can be used to prevent the food from getting rancid except:
 i. Storing the food in the air-tight containers
 ii. Storing the food in refrigerator
 iii. Keeping the food in clean and covered containers
 iv. Always touching the food with clean hands
  a. (i) and (ii)
  b. (i) and (iii)
  c. (i), (iii) and (iv)
  d. (iii) and (iv)  
Answer. d. (iii) and (iv)  
8. Rusting of iron involves a chemical reaction which is a combination of:
 a. Reduction as well as combination reactions
 b. Oxidation as well as combination reactions
 c. Reduction as well as displacement reactions
 d. Oxidation as well as displacement reactions
Answer. b. Oxidation as well as combination reactions
*The formation of rust requires iron, water and oxygen. Although it's a complex process, the chemical equation is simply 4Fe + 3O2 + 6H2O → 4Fe(OH)3.
9. You are given the following chemical reaction:
               
This reaction represents:
 a. Combination reaction as well as double displacement reaction
 b. Redox reaction as well as displacement reaction
 c. Double displacement reaction as well as redox reaction
 d. Decomposition reaction as well as displacement reaction
Answer. b. Redox reaction as well as displacement reaction
10. When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:
 a. Blue to green.
 b. Green to blue.
 c. Green to brown.
 d. Green to yellow.
Answer. c. Green to brown
11. Which of the following gases is used in the storage of fat and oil containing foods for a long time?
 a. Carbondioxide gas
 b. Nitrogen gas
 c. Oxygen gas
 d. Neon gas

Answer. b. Nitrogen gas
12. Following is given a diagram showing an experimental set-up: 
The given set-up is used to carry out:
 a. Distillation of water
 b. Purification of water
 c. Electrolysis of water
 d. Hydrolysis
Answer. c. Electrolysis of water
13. The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:
 a. Copper granules
 b. Magnesium ribbon
 c. Sodium pellets
 d. Aluminium dust
Answer. d. Aluminium dust
14. The neutralization reaction between an acid and a base is a type of:
 a. Double displacement reaction
 b. Displacement reaction
 c. Addition reaction
 d. Decomposition reaction
Answer. a. Double displacement reaction

15. The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given below:
The reducing and oxidizing agents involved in this redox reaction are:
 a. Iodine and sulphur respectively
 b. Iodine and hydrogen sulphide respectively
 c. Sulphur and iodine respectively
 d. Hydrogen sulphide and sulphur
Answer. b. Iodine and hydrogen sulphide respectively

All the above questions are also provided below in form of PDF which students may download and save them to use in offline mode as and when required:

                                                 AUTHOR: SHUBHAM GUPTA

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