1 Which salt is prepared by neutralization reaction? A Sodium chloride B Calcium carbonate C Sodium sulfate D All of these
2 Which salt is blue in color? A Sodium chloride B Copper sulfate C Ammonium chloride D Sodium nitrate
3 Collision theory explains reaction rate in terms of: A Color change B Effective collisions C Mass of reactants D Volume change
4 Which factor has no effect on enzyme activity? A pH B Temperature C Substrate concentration D Color of enzyme
5 Which graph shows effect of catalyst? A Higher activation energy B Lower activation energy C Same activation energy D No energy change
7 Which salt shows basic nature in water? A Ammonium chloride B Sodium acetate C Potassium nitrate D Sodium chloride
8 Which condition can denature enzymes? A Low pressure B Optimal pH C High temperature D Presence of substrate
10 Which property is common in most salts? A Liquid state B Low melting point C Crystalline solid D Gaseous nature
12 Fast reactions usually have: A High activation energy B Low activation energy C No collisions D Low temperature
13 Which of the following is used to control reaction rate in industry? A Catalysts B Indicators C Solvents D Salts
14 Which salt is used in photography? A Silver bromide B Sodium chloride C Potassium nitrate D Copper sulfate
15 Increasing concentration increases reaction rate because: A Particles become larger B More collisions occur C Activation energy increases D Temperature increases
16 For a collision to be effective, particles must have: A Large size B Same color C Sufficient energy D High density
17 Which salt is used in glass industry? A Sodium carbonate B Sodium chloride C Ammonium chloride D Copper sulfate
18 Which salt is insoluble in water and forms precipitate? A Sodium sulfate B Ammonium nitrate C Barium sulfate D Potassium chloride
19 Which substance speeds up a reaction without being consumed? A Reactant B Product C Catalyst D Solvent
20 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
21 Diffusion is the movement of particles from: A Low concentration to high concentration B High concentration to low concentration C Solid to liquid D Liquid to solid
22 Which salt is used as preservative in food? A Sodium chloride B Copper sulfate C Silver nitrate D Potassium permanganate
23 Enzymes are specific because: A They work for all reactions B They work for specific substrates C They are inorganic D They are consumed
24 Which salt is formed when hydrochloric acid reacts with sodium hydroxide? A Sodium sulfate B Sodium nitrate C Sodium chloride D Sodium carbonate