MCQ Science and Technology Class 9 Chapter 13 Maharashtra Board Carbon : An important element 1. Which hydrocarbon is an example of an unsaturated hydrocarbon?EthanePropaneEtheneMethaneQuestion 1 of 202. What is the molecular mass of carbon dioxide?16284456Question 2 of 203. What is the melting point of carbon dioxide?-78.5°C-56.6°C-182.5°C-161.5°CQuestion 3 of 204. What happens to limewater when carbon dioxide is passed through it?It turns blueIt turns milkyIt remains unchangedIt turns redQuestion 4 of 205. What is a use of carbon dioxide in fire extinguishers?As a fuelTo produce heatTo extinguish firesAs a lubricantQuestion 5 of 206. What is the percentage of carbon dioxide in exhaled air?0.03%2%4%10%Question 6 of 207. What is formed when carbon dioxide reacts with sodium hydroxide?Sodium bicarbonateSodium carbonateSodium chlorideSodium sulfateQuestion 7 of 208. What is the boiling point of methane?-182.5°C-161.5°C-78.5°C-56.6°CQuestion 8 of 209. Why is methane called marsh gas?It is found in coal minesIt is produced in marshy placesIt is used in marshy landsIt reacts with marsh waterQuestion 9 of 2010. Question 50: What is the main component of natural gas?EthanePropaneMethaneButaneQuestion 10 of 2011. Question 51: What happens when methane burns in oxygen?It forms nitrogenIt forms carbon dioxide and waterIt forms sulfur dioxideIt forms carbon monoxideQuestion 11 of 2012. What is produced during the chlorination of methane?Methyl chloride and HClEthane and chlorineCarbon dioxide and waterMethane and oxygenQuestion 12 of 2013. What is a use of methane in industries?As a lubricantIn fabric millsIn water purificationAs a conductorQuestion 13 of 2014. What is the percentage of methane in biogas?20–30%40–50%55–60%70–80%Question 14 of 2015. What is the first stage in biogas production?Methane gas productionProduction of acidsFormation of CO₂Decomposition of waterQuestion 15 of 2016. What is a side product of biogas production?CoalManureGraphiteDiamondQuestion 16 of 2017. What type of process is biogas production?AerobicAnaerobicThermalChemicalQuestion 17 of 2018. What is used to produce methane gas in a biogas plant?Plastic wasteAnimal dung and wet garbageMetal scrapsGlass piecesQuestion 18 of 2019. What is the chemical reaction when sodium bicarbonate reacts with sulfuric acid in a fire extinguisher?Produces CO₂Produces O₂Produces N₂Produces H₂Question 19 of 2020. What is a use of solid carbon dioxide?As a fuelIn cold storageIn glass cuttingAs a conductorQuestion 20 of 20 Loading...
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