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

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

Tags

NGSS.MS-PS1-2

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

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-5

4. 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

Tags

NGSS.MS-PS1-5

5. The process of breakdown of water into its components using electricity is:

• a. Distillation of water

• b. Purification of water

• c. Electrolysis of water

• d. Hydrolysis

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

6. 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.

Tags

NGSS.MS-PS1-2

7. 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

8. You are given the following chemical reaction:

This reaction represents:

CuO + H₂ ----------> Cu + H₂O

• 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

Tags

NGSS.MS-PS1-5

9. What do you mean by Corrosion? Write steps to prevent corrosion.

10. What is Rancidity? Write steps to prevent rancidity.