1 Vera is studying haloalkanes. She learns that haloalkanes are alkanes with halogen atoms. Which of the following is a haloalkane? A Chloromethane B Methanol C Ethanol D Acetic acid
2 Which parameter indicates the amount of salts dissolved in water? A pH B Hardness C TDS D Turbidity
3 Bilal is studying homologous series. He learns that a homologous series is a group of compounds with similar properties and a general formula. Which of the following is a characteristic of a homologous series? A Different functional groups B Same general formula and successive members differ by CH2 C Different chemical properties D No pattern in physical properties
4 Which human activity increases carbon dioxide in air? A Photosynthesis B Deforestation C Rainfall D Respiration of plants
5 Lara is studying the halogenation of methane. She knows that chlorine reacts with methane in the presence of UV light. What is the product when one chlorine atom substitutes one hydrogen atom? A CH2Cl2 B CH3Cl C CHCl3 D CCl4
6 Samir is learning about alcohols. He knows that alcohols contain a hydroxyl group. What is the general formula for alcohols? A ROH B RCOOH C RCHO D RCOR
8 Oliver is learning about the preparation of alkanes by the cracking of larger hydrocarbons. He knows that cracking produces smaller alkanes and alkenes. What is the purpose of cracking? A To produce more valuable products like gasoline B To increase the molecular weight of hydrocarbons C To convert alkanes to alkenes D To remove impurities
10 Tina is studying functional groups of alcohols. She learns that the hydroxyl group (-OH) is characteristic of alcohols. What is the name of the simplest alcohol? A Ethanol B Methanol C Propanol D Butanol
11 Eutrophication results in: A Increase in oxygen level B Death of aquatic life C Clear water D Better drinking water
12 Fatima is studying the benefits of natural substances found in water. She knows that some minerals are beneficial for health. Which of the following is a benefit of natural substances in water? A They can cause waterborne diseases B They provide essential minerals like calcium and magnesium C They increase water pollution D They make water unfit for drinking
13 Xia is studying the effects of climate change. She understands that climate change affects food production. How does climate change affect agriculture? A By increasing crop yields B By causing droughts and changing growing seasons C By improving soil quality D By reducing pests
14 Which condition is required for halogenation of alkanes? A Darkness B Sunlight or UV light C Low temperature D Water
16 Paula is studying functional groups. She learns that functional groups are specific groups of atoms that determine the properties of organic compounds. Which functional group is present in alcohols? A -OH B -COOH C -CHO D -CO-
17 Julia is studying the properties of alkanes. She knows that alkanes are less dense than water. Which of the following alkanes is used as a solvent? A Methane B Hexane C Propane D Butane
18 Emma is studying the effects of nitrates in water. She knows that high nitrate levels can be harmful. What is a consequence of high nitrate levels in drinking water? A It can cause blue baby syndrome in infants B It improves water taste C It kills all bacteria D It increases oxygen levels
19 Khalid is learning about the cracking of larger hydrocarbons. He knows that dodecane (C12H26) can be cracked to produce smaller hydrocarbons. What is one possible product of cracking dodecane? A Methane and octane B Pentane and heptane C Ethane and decane D All of the above
21 Fatima is studying alkenes. She learns that alkenes are more reactive than alkanes. What is the reason for their higher reactivity? A Presence of single bonds B Presence of double bonds C Presence of triple bonds D Presence of rings
22 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
24 Tina is studying climate change. She learns that reducing methane emissions is important. What is a major source of methane emissions from human activities? A Industrial processes B Landfills C Transportation D Air conditioning
25 Carbon monoxide is mainly produced by: A Photosynthesis B Incomplete combustion of fuels C Volcanoes D Respiration