Chemical Reactions and Equations

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Chemical Reactions and Equations - 06

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Q1. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to: *

1 point

a. Make the ribbon surface shinier

b. Remove the layer of magnesium nitride from the ribbon surface

c. Remove the layer of magnesium carbonate from the ribbon surface

d. Remove the moisture from the ribbon surface

Q2. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of - *

1 point

a. Hydrochloric acid

b. Barium sulphate

c. Chlorine

d. Sulphur

Q3. 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 - *

1 point

a. Exothermic process

b. Endothermic process

c. Reversible process

d. Physical process

Q4. A chemical reaction does not involve - *

1 point

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

Q5. One of the following processes does not involve a chemical reaction. That is - *

1 point

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

Q6. It is necessary to balance a chemical equation in order to satisfy the law of - *

1 point

a. Conservation of motion

b. Conservation of momentum

c. Conservation of energy

d. Conservation of mass

Q7. 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 *

1 point

a. (i) and (ii)

b. (i) and (iii)

c. (i), (iii) and (iv)

d. (iii) and (iv)

Q8. Rusting of iron involves a chemical reaction which is a combination of - *

1 point

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

Q9. You are given the following chemical reaction - *

1 point

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

Q10. When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from - *

1 point

a. Blue to green.

b. Green to blue.

c. Green to brown.

a brown residue is left

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