1 Julia is learning about oxides. She knows that neutral oxides do not react with acids or bases. Which of the following is a neutral oxide? A CO2 B SO2 C H2O D Na2O
2 Which base is commonly used in soap making? A Calcium hydroxide B Potassium hydroxide C Ammonium hydroxide D Magnesium hydroxide
3 Ahmed is learning about reversible reactions in his chemistry class. His teacher explains that in a reversible reaction, the products can react to form the original reactants. Which of the following represents a reversible reaction? A A + B → C + D B A + B ⇌ C + D C A + B → C D C + D → A + B
4 Lara is studying basic oxides. She knows that basic oxides react with water to form bases. Which of the following is a basic oxide? A CO2 B SO2 C CaO D P2O5
5 Ahmed is studying the properties of bases. He knows that bases have a bitter taste and turn red litmus blue. What is the pH of a typical base solution? A Less than 7 B Greater than 7 C Equal to 7 D Between 4 and 6
6 Ethan is learning about dynamic equilibrium. He knows that equilibrium can be established in a closed system. Which of the following is an example of a closed system? A A sealed flask containing water and ice B An open beaker C A river D A human body
7 Diana is studying the concept of reversible reactions. She learns that some reactions can be driven to completion by removing products. How does removing a product affect a reversible reaction? A It shifts the equilibrium to the left B It shifts the equilibrium to the right C It has no effect D It stops the reaction
8 Chemical equilibrium is achieved when: A Reaction stops completely B Concentration of reactants becomes zero C Forward and reverse reaction rates are equal D Products stop reacting
9 The products of neutralization reaction are: A Salt and hydrogen B Salt and water C Acid and water D Base and water
10 Fatima is studying strong acids. She knows that strong acids completely ionize in water. Which of the following is a strong acid? A HNO3 B H2CO3 C H3PO4 D CH3COOH
11 Usman is learning about dynamic equilibrium. He understands that at equilibrium, the rates of the forward and reverse reactions are equal. What does this imply about the concentrations of reactants and products? A They are increasing B They are decreasing C They are constant D They are fluctuating
12 Which factor affects equilibrium in gaseous reactions only? A Temperature B Pressure C Catalyst D Concentration
13 At equilibrium, the rate of forward reaction is: A Greater than reverse B Less than reverse C Equal to reverse D Zero
15 Which base is used as antacid? A Sodium hydroxide B Potassium hydroxide C Magnesium hydroxide D Calcium oxide
16 Neutralization reaction occurs between: A Acid and acid B Base and base C Acid and base D Salt and water
17 Which salt is commonly known as table salt? A Potassium chloride B Sodium carbonate C Sodium chloride D Calcium chloride
18 Omar is learning about chemical equilibrium. He understands that equilibrium is a state of balance. Which of the following is NOT a condition for equilibrium? A Reaction must be reversible B System must be closed C Rates of forward and reverse reactions must be equal D Concentrations of reactants and products must be equal
19 George is studying strong bases. He knows that strong bases completely dissociate in water. Which of the following is a strong base? A NH3 B KOH C Fe(OH)3 D Al(OH)3
20 A catalyst affects equilibrium by: A Changing equilibrium constant B Shifting equilibrium C Increasing rate of both reactions D Stopping reverse reaction
21 Waleed is learning about chemical equilibrium. He knows that the equilibrium constant (K) does not depend on the initial concentrations. What does K depend on? A Initial concentrations B Temperature C Pressure D Catalyst
22 Vera is studying chemical equilibrium. She learns that a closed system is essential. What is a closed system? A A system that can exchange matter with the surroundings B A system that can exchange energy but not matter with the surroundings C A system that cannot exchange energy or matter with the surroundings D A system that is open to the atmosphere
23 Which statement about equilibrium is correct? A Equilibrium means reaction stops B Equilibrium can occur in open systems C Equilibrium is dynamic D Equilibrium favors reactants always
24 Bongani is studying the effect of a catalyst on equilibrium. He learns that a catalyst speeds up both the forward and reverse reactions equally. What is the effect of a catalyst on the equilibrium position? A It shifts the equilibrium to the right B It shifts the equilibrium to the left C It has no effect on the equilibrium position D It prevents equilibrium from being reached
25 Which acid is produced in our stomach? A Nitric acid B Sulfuric acid C Hydrochloric acid D Acetic acid
26 Waseem is learning about oxides. He knows that oxides can be acidic, basic, amphoteric, or neutral. Which of the following is an example of a neutral oxide? A CO2 B Na2O C NO D Al2O3
27 The equilibrium constant expression includes: A Only reactants B Only products C Products over reactants D Catalyst concentration
28 Nadia is studying reversible reactions and dynamic equilibrium. She learns that a catalyst does not affect the position of equilibrium. Why is this? A Because a catalyst increases the rate of both forward and reverse reactions equally B Because a catalyst stops the reaction C Because a catalyst only speeds up the forward reaction D Because a catalyst only speeds up the reverse reaction
29 Patricia is studying weak bases. She knows that weak bases have low dissociation in water. Which of the following is a weak base? A NaOH B KOH C NH3 D Ca(OH)2
30 Xia is studying the conditions for equilibrium. She learns that equilibrium is a dynamic process. Which of the following is an example of a system at dynamic equilibrium? A A sealed container of water and ice at 0°C B A burning candle C A piece of iron rusting D A glass of soda losing its fizz