Which of the following is used as a preservative in fruit juices? (A) Sodium chloride (B) Sodium benzoate (C) Sodium bicarbonate (D) Sodium hydroxide Answer: (B)
The number of covalent bonds in ethane (C₂H₆) is – (A) 6 (B) 7 (C) 8 (D) 9 Answer: (D)
The element essential for photosynthesis is – (A) Magnesium (B) Calcium (C) Iron (D) Sulfur Answer: (A)
Which element is used in the preparation of match sticks? (A) Nitrogen (B) Phosphorus (C) Carbon (D) Sulfur Answer: (B)
Which gas is liberated when zinc reacts with dilute sulfuric acid? (A) CO₂ (B) H₂ (C) O₂ (D) Cl₂ Answer: (B)
The molecular formula of acetone is – (A) CH₃CHO (B) CH₃COCH₃ (C) CH₃OH (D) CH₃COOH Answer: (B)
A solution with pH 12 is – (A) Weak acid (B) Strong acid (C) Weak base (D) Strong base Answer: (D)
Which type of bonding is present in MgCl₂? (A) Covalent (B) Ionic (C) Metallic (D) Hydrogen Answer: (B)
Which group of elements are known as chalcogens? (A) Group 14 (B) Group 15 (C) Group 16 (D) Group 17 Answer: (C)
Which process converts fats into soap? (A) Hydrolysis (B) Esterification (C) Saponification (D) Neutralization Answer: (C)
Which of the following is used in fuel cells? (A) Nitrogen (B) Oxygen (C) Hydrogen (D) Both B and C Answer: (D)
The number of lone pairs on oxygen atom in H₂O is – (A) 0 (B) 1 (C) 2 (D) 3 Answer: (C)
Which gas is used for artificial fruit ripening? (A) Ethylene (B) Methane (C) CO₂ (D) Acetylene Answer: (A)
Which element is found in amino acids but not in carbohydrates? (A) Carbon (B) Hydrogen (C) Nitrogen (D) Oxygen Answer: (C)
Which indicator turns pink in basic solution? (A) Litmus (B) Methyl orange (C) Phenolphthalein (D) Universal indicator Answer: (C)
Which compound is used as a coolant in automobiles? (A) Water (B) Ethylene glycol (C) Methanol (D) Glycerol Answer: (B)
Which property of water helps in temperature regulation of the body? (A) Low viscosity (B) High surface tension (C) High specific heat (D) High boiling point Answer: (C)
Which metal is used in making heating elements? (A) Iron (B) Copper (C) Nichrome (D) Aluminum Answer: (C)
Which of these is an alkali? (A) HCl (B) CH₃COOH (C) NH₄OH (D) HNO₃ Answer: (C)
Which of the following contains peptide bonds? (A) Carbohydrates (B) Fats (C) Proteins (D) Vitamins Answer: (C)
Which acid is used in the manufacture of fertilizers? (A) Nitric acid (B) Hydrochloric acid (C) Sulfuric acid (D) Both A and C Answer: (D)
Which of the following is a radioactive metal? (A) Uranium (B) Iron (C) Silver (D) Copper Answer: (A)
What is the chemical name of lime? (A) Calcium carbonate (B) Calcium hydroxide (C) Calcium oxide (D) Calcium chloride Answer: (C)
The catalyst used in hydrogenation of oils is – (A) Nickel (B) Copper (C) Zinc (D) Silver Answer: (A)
Which metal is present in chlorophyll? (A) Iron (B) Magnesium (C) Calcium (D) Zinc Answer: (B)
Which of these elements forms a colored compound? (A) Zinc (B) Copper (C) Sodium (D) Magnesium Answer: (B)
Which metal is most malleable? (A) Gold (B) Iron (C) Copper (D) Zinc Answer: (A)
The bond angle in ammonia (NH₃) is approximately – (A) 109.5° (B) 107° (C) 120° (D) 90° Answer: (B)
Which compound is used to test the presence of CO₂? (A) Limewater (B) Sodium hydroxide (C) Ammonium hydroxide (D) HCl Answer: (A)
Which of the following gives yellow flame in flame test? (A) Calcium (B) Potassium (C) Sodium (D) Lithium Answer: (C)
Which vitamin is synthesized in our body with sunlight? (A) Vitamin C (B) Vitamin D (C) Vitamin B₁₂ (D) Vitamin K Answer: (B)
Which of the following is biodegradable? (A) Plastic (B) Paper (C) Polythene (D) Thermocol Answer: (B)
Which element is a metalloid? (A) Boron (B) Barium (C) Bismuth (D) Bromine Answer: (A)
Which among the following is used in fire extinguishers? (A) Nitrogen (B) CO₂ (C) Oxygen (D) Hydrogen Answer: (B)
Which of these is used as an antiseptic? (A) Formaldehyde (B) Sodium chloride (C) Iodine (D) Chlorine Answer: (C)
The test used to distinguish alcohol and phenol is – (A) Lucas test (B) Litmus test (C) Ferric chloride test (D) Iodoform test Answer: (C)
Which of these elements is used in fluorescent lamps? (A) Neon (B) Sodium (C) Argon (D) Mercury Answer: (D)
Which of the following is used in explosives? (A) Ammonium nitrate (B) Baking soda (C) Potassium chloride (D) Ammonium sulfate Answer: (A)
The element present in hemoglobin is – (A) Copper (B) Iron (C) Zinc (D) Magnesium Answer: (B)
Which group in the periodic table contains noble gases? (A) Group 14 (B) Group 16 (C) Group 17 (D) Group 18 Answer: (D)
Which of the following is not a greenhouse gas? (A) CO₂ (B) CH₄ (C) O₂ (D) N₂O Answer: (C)
Which of these shows hydrogen bonding? (A) CH₄ (B) NH₃ (C) CO₂ (D) HCl Answer: (B)
Which of the following is used to soften water? (A) Common salt (B) Bleaching powder (C) Zeolite (D) Washing soda Answer: (C)
What is the IUPAC name of acetone? (A) Propanone (B) Butanone (C) Ethanal (D) Methanal Answer: (A)
The chemical used to prepare soap is – (A) H₂SO₄ (B) NaOH (C) NaCl (D) Ca(OH)₂ Answer: (B)
Which of these is a saturated hydrocarbon? (A) Ethene (B) Propane (C) Butene (D) Ethyne Answer: (B)
Which gas is used in the preparation of soda water? (A) CO (B) CO₂ (C) O₂ (D) H₂ Answer: (B)
Which element has no neutron in its atom? (A) Helium (B) Hydrogen (C) Lithium (D) Oxygen Answer: (B)
Which color flame does lithium produce? (A) Crimson red (B) Green (C) Violet (D) Blue Answer: (A)
Which is the smallest particle of an element that retains its chemical properties? (A) Atom (B) Molecule (C) Ion (D) Electron Answer: (A)
