Which gas is used to manufacture HCl acid? (A) Hydrogen (B) Chlorine (C) Hydrogen chloride (D) Ammonia Answer: (C)
Which of the following is used as a fuel in rockets? (A) Liquid oxygen (B) Liquid hydrogen (C) Both A and B (D) Ethanol Answer: (C)
Which compound is used as a refrigerant? (A) Freon (B) Methane (C) Ethanol (D) Propane Answer: (A)
Which acid is found in tea? (A) Tannic acid (B) Citric acid (C) Oxalic acid (D) Acetic acid Answer: (A)
Which among the following is an example of a homogeneous mixture? (A) Smoke (B) Soil (C) Sugar solution (D) Salad Answer: (C)
Which type of bond is formed in H₂ molecule? (A) Ionic (B) Metallic (C) Coordinate (D) Covalent Answer: (D)
Which element is used in vulcanization of rubber? (A) Carbon (B) Sulfur (C) Nitrogen (D) Chlorine Answer: (B)
Which organic compound gives a positive iodoform test? (A) Ethanol (B) Methanol (C) Propanol (D) Methanal Answer: (A)
Which is the most abundant isotope of hydrogen? (A) Protium (B) Deuterium (C) Tritium (D) None Answer: (A)
The unit of molarity is – (A) mol (B) mol/kg (C) mol/L (D) mol/m³ Answer: (C)
Which compound is used to manufacture glass? (A) NaCl (B) Na₂CO₃ (C) NaOH (D) NaHCO₃ Answer: (B)
Which of the following is not a conductor of electricity? (A) Copper (B) Aluminum (C) Sulfur (D) Silver Answer: (C)
Which salt is used in agriculture to neutralize acidic soil? (A) Ammonium sulfate (B) Calcium carbonate (C) Sodium nitrate (D) Potassium sulfate Answer: (B)
Which of these gases is monoatomic? (A) O₂ (B) N₂ (C) He (D) H₂ Answer: (C)
Which is a characteristic of a chemical reaction? (A) Change in temperature (B) Change in color (C) Evolution of gas (D) All of the above Answer: (D)
Which compound is added to toothpaste to prevent tooth decay? (A) CaCO₃ (B) NaF (C) NaCl (D) CaCl₂ Answer: (B)
Which of the following reacts with water vigorously? (A) Copper (B) Silver (C) Sodium (D) Gold Answer: (C)
Which of the following has no neutron? (A) Helium (B) Hydrogen (C) Oxygen (D) Nitrogen Answer: (B)
The pH of rainwater is slightly acidic due to – (A) CO₂ (B) SO₂ (C) NO₂ (D) All of the above Answer: (D)
Which gas is responsible for the smell of rotten eggs? (A) CO₂ (B) NH₃ (C) H₂S (D) Cl₂ Answer: (C)
Which one is an example of a base? (A) NaCl (B) CH₃COOH (C) NaOH (D) HNO₃ Answer: (C)
Which among the following is an exothermic reaction? (A) Photosynthesis (B) Melting of ice (C) Combustion (D) Evaporation Answer: (C)
Which oxide is used in making refractory bricks? (A) Al₂O₃ (B) Na₂O (C) CaO (D) MgO Answer: (A)
Which radioactive element is used for dating very old rocks? (A) Carbon-14 (B) Uranium-238 (C) Iodine-131 (D) Cobalt-60 Answer: (B)
Which is the heaviest halogen? (A) Fluorine (B) Chlorine (C) Bromine (D) Iodine Answer: (D)
Which of these is not a metalloid? (A) Boron (B) Silicon (C) Arsenic (D) Sulfur Answer: (D)
Which of the following is an acid-base indicator? (A) Sodium chloride (B) Potassium permanganate (C) Methyl orange (D) Urea Answer: (C)
Which type of solution is milk? (A) Suspension (B) Colloid (C) True solution (D) Compound Answer: (B)
Which one of the following is a linear molecule? (A) H₂O (B) NH₃ (C) CO₂ (D) CH₄ Answer: (C)
Which of the following is not biodegradable? (A) Paper (B) Cotton (C) Plastic (D) Food waste Answer: (C)
Which of the following is an ionic compound? (A) CH₄ (B) NaCl (C) CO₂ (D) H₂O Answer: (B)
Which compound gives a brick-red flame in flame test? (A) Sodium (B) Potassium (C) Calcium (D) Barium Answer: (C)
Which hydrocarbon is unsaturated? (A) Methane (B) Propane (C) Butane (D) Ethylene Answer: (D)
Which of these is used to make soap? (A) Alcohol (B) Glycerol (C) Fatty acid + Alkali (D) Ketone Answer: (C)
The IUPAC name of acetic acid is – (A) Methanoic acid (B) Propanoic acid (C) Butanoic acid (D) Ethanoic acid Answer: (D)
Which metal is used in fireworks to produce green color? (A) Barium (B) Strontium (C) Sodium (D) Calcium Answer: (A)
Which property of carbon allows it to form a large number of compounds? (A) Catenation (B) Combustion (C) Ionization (D) Sublimation Answer: (A)
Which of the following has the highest melting point? (A) Ice (B) NaCl (C) Wax (D) Mercury Answer: (B)
Which vitamin is synthesized in human skin? (A) Vitamin A (B) Vitamin B (C) Vitamin C (D) Vitamin D Answer: (D)
Which gas is used in fire suppression systems? (A) Oxygen (B) CO₂ (C) Hydrogen (D) Helium Answer: (B)
Which compound is used in deodorants as an antiperspirant? (A) Aluminum chloride (B) Zinc sulfate (C) Iron nitrate (D) Calcium hydroxide Answer: (A)
What is the primary component of natural gas? (A) Propane (B) Butane (C) Methane (D) Ethane Answer: (C)
Which of the following elements is liquid above 30°C? (A) Gallium (B) Mercury (C) Cesium (D) Bromine Answer: (A)
Which gas turns limewater milky? (A) NH₃ (B) CO₂ (C) H₂ (D) NO₂ Answer: (B)
Which element is the best conductor of electricity? (A) Gold (B) Silver (C) Copper (D) Aluminum Answer: (B)
Which of the following is a nucleic acid? (A) DNA (B) Glucose (C) Protein (D) Fat Answer: (A)
Which of the following is a ketone? (A) Ethanol (B) Acetone (C) Methanoic acid (D) Formaldehyde Answer: (B)
Which of the following is not found in DNA? (A) Adenine (B) Guanine (C) Uracil (D) Cytosine Answer: (C)
Which gas is evolved when an acid reacts with a metal? (A) H₂ (B) CO₂ (C) NH₃ (D) O₂ Answer: (A)
Which of the following is a Lewis acid? (A) NH₃ (B) H₂O (C) BF₃ (D) OH⁻ Answer: (C)
