2 In collision theory, proper orientation means: A Particles must collide head-on B Particles must be parallel C Particles must collide randomly D Particles must have same mass
3 Which factor does NOT affect the rate of reaction? A Temperature B Pressure C Color of reactants D Concentration
4 Which salt is prepared by direct combination? A Sodium chloride B Calcium carbonate C Sodium hydroxide D Ammonium chloride
9 Which salt conducts electricity in molten state? A Covalent salt B Ionic salt C Organic salt D Neutral compound
10 Which salt is used in photography? A Silver bromide B Sodium chloride C Potassium nitrate D Copper sulfate
11 Which salt is used in fire extinguishers? A Sodium bicarbonate B Sodium chloride C Copper sulfate D Potassium nitrate
12 Which functional group determines the chemical properties of organic compounds? A Carbon chain B Hydrogen atom C Functional group D Molecular mass
14 Which organic compound contains both carbon and hydrogen only? A Alcohol B Ester C Hydrocarbon D Carboxylic acid
15 Activation energy is defined as: A Energy released during reaction B Minimum energy required for reaction C Energy of products D Total energy of reactants
19 Milk turning into yogurt is an example of: A Physical change B Enzyme catalyzed reaction C Diffusion D Evaporation
20 Which salt is known as washing soda? A Sodium bicarbonate B Sodium carbonate C Sodium chloride D Calcium carbonate