Free Chemistry in Daily Life MCQs with Answers

• A. Carbon dioxide
• B. Sugar
• C. Bacteria
• D. Oxygen
• E. None of these

Explanation: Yeast ferments sugars in dough and releases carbon dioxide gas. The trapped gas bubbles make the dough rise, while the alcohol produced…

• A. Manganese
• B. Magnesium
• C. Gypsum
• D. Bauxite
• E. None of these

Explanation: Gypsum is hydrated calcium sulfate, a non-metallic mineral used in plaster and cement.

• A. Carbon
• B. Gold
• C. Silver
• D. Platinum
• E. None of these

Explanation: Diamond is a crystalline allotrope of carbon, with each carbon atom bonded in a strong three-dimensional structure.

• A. Copper and Zinc
• B. Tin and Zinc
• C. Copper and Tin
• D. Iron and Zinc
• E. None of these

Explanation: Bronze is primarily an alloy of copper and tin. Copper and zinc form brass, which is the common alloy confused with bronze.

• A. Sodium Nitrate
• B. Dilute acetic acid
• C. Chloride of lime
• D. Calcium

Explanation: Vinegar is a dilute aqueous solution of acetic acid, usually containing about 4 to 8 percent acetic acid.

• A. Methane hydrate
• B. Liquid Nitrogen
• C. Solid Carbon dioxide
• D. Frozen Water
• E. None of these

Explanation: Dry ice is solid carbon dioxide. It changes directly from solid to gas by sublimation, rather than melting into a liquid under ordinary…

• A. Insecticides
• B. Rodenticides
• C. Fungicides
• D. Herbicides
• E. None of these

Explanation: Rodenticides are chemicals designed to kill rodents such as rats and mice.

• A. Decomposition
• B. Respiration
• C. Digestion
• D. Fermentation
• E. None of these

Explanation: Fermentation uses microorganisms to convert sugars into useful products such as bread, yogurt, alcohol and organic acids.

• A. Nitrogen + Hydrogen
• B. Nitrogen + Carbon
• C. Nitrogen + Oxygen
• D. Oxygen + Carbon
• E. None of these

Explanation: Laughing gas is nitrous oxide, N₂O, so it contains nitrogen and oxygen.

• A. Cotton
• B. Poplar
• C. Bagasse
• D. Rice straw

Explanation: Poplar is a woody tree whose wood is processed into pulp for papermaking.

• A. 80%
• B. 95%
• C. 70%
• D. 85%Exploring Online Chemistry Courses

Explanation: Rectified spirit is highly purified ethanol obtained by repeated distillation and typically contains about 95% alcohol by volume.

• A. copper,nickel
• B. copper, tin
• C. copper, silver
• D. copper, zinc

Explanation: Bronze is traditionally an alloy of copper and tin, valued for its hardness and corrosion resistance.

• A. N, P, K
• B. N, C, P
• C. N, K,
• D. N, S, P

Explanation: Nitrogen, phosphorus and potassium are the three primary macronutrients required by plants.

• A. Water
• B. Salts
• C. Vapours
• D. Plasma

Explanation: Plasma is an ionised gas containing free electrons and ions, and it behaves differently from solids, liquids and ordinary gases.

• A. Carbon, Hydrogen and Oxygen
• B. Carbon, Hydrogen and Nitrogen
• C. Carbon, Oxygen and Nitrogen
• D. Hydrogen, Oxygen and Nitrogen

Explanation: Natural fats and oils are mainly triglycerides, whose molecules contain carbon, hydrogen and oxygen.

• A. Carbon Dioxide
• B. Sulfur Dioxide
• C. Nitrous Oxide
• D. Sodium Oxide

Explanation: Nitrous oxide, N2O, is called laughing gas and has been used as an inhaled anaesthetic and analgesic.

• A. Carbon
• B. Hydrogen
• C. Nitrogen
• D. Silicon

Explanation: Diamond is an allotrope of carbon, meaning it is a different structural form of the same element.

• A. Solid Oxygen
• B. Solid Carbon Dioxide
• C. Solid Hydrogen
• D. Solid Nitrogen

Explanation: Dry ice is carbon dioxide in its solid state. It changes directly into gas by sublimation instead of melting into a liquid at normal…

• A. Gain of Electrons
• B. Loss of Electrons
• C. Gain of Protons
• D. Loss of Protons

Explanation: In modern redox terminology, oxidation means loss of electrons, while reduction means gain of electrons.

• A. River water
• B. Canal water
• C. Sea water
• D. Water in a lake

Explanation: Sea water freezes last because dissolved salts lower its freezing point below that of fresh water.