3 For a reversible reaction, if Kc is very large, it indicates: A Reaction favors reactants B Reaction favors products C Reaction is very slow D No reaction occurs
6 The main function of fertilizers is to: A Kill pests B Increase soil fertility C Control pollution D Increase rainfall
9 Chemical equilibrium can be achieved in: A Open system only B Closed system only C Any system D Vacuum
10 Which biomolecule provides structural support in plants? A Starch B Glycogen C Cellulose D Sucrose
11 Le Chatelier’s principle states that when a system at equilibrium is disturbed: A It stops reacting B It adjusts to counteract the change C It decomposes D Temperature remains unchanged
13 Which nutrient is mainly responsible for body growth and repair? A Carbohydrates B Lipids C Proteins D Minerals
15 Fractional distillation of petroleum separates components based on: A Density B Melting point C Boiling point D Solubility
18 Acid rain is mainly caused by oxides of: A Nitrogen and sulphur B Carbon and hydrogen C Oxygen and nitrogen D Chlorine and fluorine
19 Which biomolecule is the main source of energy for the body? A Proteins B Lipids C Carbohydrates D Vitamins