1 Khalid is studying the properties of water. He knows that water has a high specific heat capacity. What is the significance of high specific heat capacity? A Water heats up quickly B Water cools down quickly C Water resists temperature changes, helping to regulate climate D Water evaporates easily
2 Le Chatelier’s principle explains the effect of: A Temperature only B Pressure only C Disturbances on equilibrium D Catalyst
3 Which famous monument is damaged by acid rain? A Great Wall B Eiffel Tower C Taj Mahal D Statue of Liberty
4 Ethan is studying the effects of acid rain. He learns that acid rain can damage aquatic ecosystems. How does acid rain affect aquatic life? A It increases oxygen levels B It lowers the pH of water, harming fish and other organisms C It increases temperature D It adds nutrients
5 Vera is learning about photosynthesis. She understands that photosynthesis is a natural process that helps reduce CO2. What is the product of photosynthesis that is released into the atmosphere? A Carbon dioxide B Oxygen C Methane D Nitrogen
6 Uma is studying water treatment. She knows that coagulation involves the addition of chemicals. What is the purpose of adding alum in coagulation? A To add minerals B To neutralize acids C To make suspended particles clump together D To kill bacteria
7 Yusuf is studying water pollution. He knows that phosphates from detergents can cause problems. What is a major issue caused by phosphates in water? A They kill all fish B They promote algal blooms that deplete oxygen C They make water acidic D They increase water clarity
8 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
9 Lara is learning about oxides. She knows that basic oxides react with acids to form salts and water. Which of the following is a basic oxide? A CO2 B SO2 C Na2O D P2O5
11 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
12 Chemical equilibrium is important in industry because it: A Stops reactions B Controls product yield C Eliminates catalysts D Prevents reactions
13 Emma is learning about water treatment processes. She knows that coagulation helps to remove suspended particles. What is added to water to help particles clump together during coagulation? A Chlorine B Alum C Fluoride D Ozone
14 Which gas protects life on Earth from ultraviolet radiation? A Oxygen B Nitrogen C Ozone D Carbon dioxide
15 Tina is studying the effect of pressure on equilibrium. She knows that for a reaction with more moles of gas on the reactant side, increasing pressure will shift the equilibrium to: A The left B The right C No effect D Both sides equally
16 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
17 Which base is used as antacid? A Sodium hydroxide B Potassium hydroxide C Magnesium hydroxide D Calcium oxide
18 Which parameter indicates the amount of salts dissolved in water? A pH B Hardness C TDS D Turbidity
19 Excess fertilizers in water bodies cause: A Eutrophication B Evaporation C Condensation D Distillation
20 Victor is studying the effects of fertilizers on water. He knows that nitrates from fertilizers can cause health problems. What is a health risk associated with high nitrate levels in water? A Skin irritation B Methemoglobinemia (blue baby syndrome) C Respiratory problems D Hair loss
21 Which international agreement aims to protect the ozone layer? A Kyoto Protocol B Montreal Protocol C Paris Agreement D Geneva Convention
22 Which acid is produced in our stomach? A Nitric acid B Sulfuric acid C Hydrochloric acid D Acetic acid
23 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
24 Increase in pressure favors the side with: A More moles of gas B Less moles of gas C Equal moles D Solids only
25 Xia is studying weak bases. She knows that weak bases partially ionize in water. Which of the following is a weak base? A NaOH B KOH C NH4OH D Ca(OH)2
26 Qasim is learning about strategies to reduce acid rain. He understands that reducing SO2 emissions is key. How can SO2 emissions be reduced? A Using higher sulfur coal B Using flue gas desulfurization (scrubbers) C Burning more coal D Reducing the use of renewable energy
27 Which method is used to kill harmful microorganisms in water? A Filtration B Chlorination C Sedimentation D Aeration
28 Quinn is studying water scarcity in Pakistan. He learns that population growth is a major factor. How does population growth contribute to water scarcity? A It increases the demand for water B It reduces rainfall C It cleans water resources D It increases groundwater recharge
29 Uma is studying strong and weak acids. She knows that strong acids are better conductors of electricity than weak acids. Which of the following is a strong acid? A CH3COOH B HNO3 C H2CO3 D H2S