Q.1 Which of the following is commonly used as an antacid to neutralize stomach acid?
Sodium hydroxide
Calcium carbonate
Hydrochloric acid
Sulfuric acid
Explanation - Calcium carbonate (CaCO₃) is commonly used in antacid tablets to neutralize excess hydrochloric acid in the stomach.
Correct answer is: Calcium carbonate
Q.2 Which vitamin is known as ascorbic acid?
Vitamin A
Vitamin B12
Vitamin C
Vitamin D
Explanation - Vitamin C is chemically known as ascorbic acid and is essential for preventing scurvy.
Correct answer is: Vitamin C
Q.3 Which of the following chemicals is used in the preparation of soaps?
Sodium chloride
Sodium hydroxide
Sulfuric acid
Potassium permanganate
Explanation - Sodium hydroxide (NaOH) is used to saponify fats and oils to produce soap.
Correct answer is: Sodium hydroxide
Q.4 Which of these is used as a preservative in soft drinks?
Sodium benzoate
Sodium chloride
Calcium carbonate
Sodium hydroxide
Explanation - Sodium benzoate acts as a preservative to inhibit microbial growth in acidic foods and beverages.
Correct answer is: Sodium benzoate
Q.5 Which chemical is commonly found in antiseptic solutions like Dettol?
Phenol
Methanol
Acetic acid
Sulfuric acid
Explanation - Phenol and its derivatives have antiseptic properties and are used in disinfectants like Dettol.
Correct answer is: Phenol
Q.6 Which of the following is a source of iodine in the human diet?
Salt
Sugar
Rice
Vegetable oil
Explanation - Iodized salt is the primary source of dietary iodine to prevent goiter.
Correct answer is: Salt
Q.7 Which of the following chemicals is used in bleaching agents?
Sodium chloride
Calcium oxide
Sodium hypochlorite
Potassium permanganate
Explanation - Sodium hypochlorite (NaOCl) is commonly used in bleaching powders and household bleach.
Correct answer is: Sodium hypochlorite
Q.8 Which metal is used in thermometers and has antiseptic properties?
Mercury
Lead
Aluminium
Zinc
Explanation - Mercury is used in thermometers and also in some antiseptic applications due to its antimicrobial properties.
Correct answer is: Mercury
Q.9 Which of these is commonly used as a mosquito repellent?
DEET
Sodium hydroxide
Potassium chloride
Calcium carbonate
Explanation - DEET (N,N-Diethyl-meta-toluamide) is widely used in mosquito repellents.
Correct answer is: DEET
Q.10 Which of the following is a commonly used analgesic (painkiller)?
Aspirin
Vitamin D
Iodine
Sodium bicarbonate
Explanation - Aspirin (acetylsalicylic acid) is used to relieve pain, reduce inflammation, and lower fever.
Correct answer is: Aspirin
Q.11 Which of the following is used in making fireworks to produce red color?
Strontium salts
Sodium chloride
Calcium carbonate
Potassium hydroxide
Explanation - Strontium salts impart a red color to flames in fireworks.
Correct answer is: Strontium salts
Q.12 Which of the following is used in cold creams as a moisturizer?
Lanolin
Phenol
Sulfuric acid
Sodium hydroxide
Explanation - Lanolin is a natural wax from sheep's wool and is used in skin care products for moisturizing.
Correct answer is: Lanolin
Q.13 Which gas is commonly used in the treatment of jaundice in newborns?
Oxygen
Helium
Blue light (phototherapy)
Nitrogen
Explanation - Phototherapy using blue light helps to break down bilirubin in newborns with jaundice.
Correct answer is: Blue light (phototherapy)
Q.14 Which compound is used as a disinfectant in swimming pools?
Chlorine
Sodium carbonate
Potassium chloride
Ammonium nitrate
Explanation - Chlorine is added to swimming pools to kill bacteria and maintain hygienic water.
Correct answer is: Chlorine
Q.15 Which vitamin is essential for blood clotting?
Vitamin K
Vitamin A
Vitamin C
Vitamin D
Explanation - Vitamin K is essential for the synthesis of clotting factors and helps in blood coagulation.
Correct answer is: Vitamin K
Q.16 Which of the following is used in toothpaste for strengthening teeth?
Calcium carbonate
Sodium fluoride
Sulfuric acid
Potassium hydroxide
Explanation - Sodium fluoride helps in remineralization of teeth and prevents dental caries.
Correct answer is: Sodium fluoride
Q.17 Which of the following is used as an antiseptic for minor cuts?
Iodine solution
Sulfuric acid
Sodium hydroxide
Calcium oxide
Explanation - Iodine solution is used externally to prevent infections in minor cuts and wounds.
Correct answer is: Iodine solution
Q.18 Which of these compounds is commonly used in antiperspirants?
Aluminium chloride
Sodium hydroxide
Calcium carbonate
Sodium chloride
Explanation - Aluminium chloride helps reduce sweating by blocking sweat glands in antiperspirants.
Correct answer is: Aluminium chloride
Q.19 Which substance is commonly used for water purification?
Alum (Potassium aluminium sulfate)
Sodium chloride
Sodium hydroxide
Calcium oxide
Explanation - Alum is used to coagulate impurities in water, making it easier to remove them during purification.
Correct answer is: Alum (Potassium aluminium sulfate)
Q.20 Which of the following is used in making explosives like dynamite?
Nitroglycerin
Calcium carbonate
Sodium bicarbonate
Sulfuric acid
Explanation - Nitroglycerin is a highly explosive compound used in making dynamite.
Correct answer is: Nitroglycerin
Q.21 Which metal is used in the production of antiseptic silver nitrate?
Silver
Copper
Zinc
Aluminium
Explanation - Silver nitrate is derived from silver and has antiseptic properties, commonly used in wound care.
Correct answer is: Silver
Q.22 Which compound is used in hair dyes?
Paraphenylenediamine
Calcium carbonate
Sodium hydroxide
Phenol
Explanation - Paraphenylenediamine (PPD) is commonly used in hair dye formulations for coloring hair.
Correct answer is: Paraphenylenediamine
Q.23 Which of the following is used as a cooling agent in some cough syrups?
Menthol
Ethanol
Acetic acid
Phenol
Explanation - Menthol provides a cooling sensation and is used in cough syrups and lozenges.
Correct answer is: Menthol
Q.24 Which of the following is used in the production of detergents?
Linear alkyl benzene sulfonates
Calcium carbonate
Sodium chloride
Sulfuric acid
Explanation - Linear alkyl benzene sulfonates are key surfactants used in detergents to remove grease and dirt.
Correct answer is: Linear alkyl benzene sulfonates
Q.25 Which gas is released when baking soda reacts with vinegar?
Carbon dioxide
Oxygen
Nitrogen
Hydrogen
Explanation - Baking soda (sodium bicarbonate) reacts with vinegar (acetic acid) to release carbon dioxide gas.
Correct answer is: Carbon dioxide