Which of the following is an amphoteric oxide?
(A) CO₂
(B) Na₂O
(C) Al₂O₃
(D) SO₂
Answer: (C)

Which compound is responsible for the pungent smell of vinegar?
(A) Formic acid
(B) Acetic acid
(C) Lactic acid
(D) Tartaric acid
Answer: (B)

Which of these is used to test for the presence of starch?
(A) Iodine solution
(B) Benedict’s reagent
(C) Biuret solution
(D) Limewater
Answer: (A)

Which of the following is used to treat acidity in the stomach?
(A) Sodium chloride
(B) Magnesium hydroxide
(C) Ammonium nitrate
(D) Potassium carbonate
Answer: (B)

Which of the following is a greenhouse gas?
(A) Carbon dioxide
(B) Nitrous oxide
(C) Methane
(D) All of the above
Answer: (D)

Which is the lightest alkali metal?
(A) Potassium
(B) Sodium
(C) Lithium
(D) Rubidium
Answer: (C)

Which among the following elements is used in the treatment of goiter?
(A) Fluorine
(B) Bromine
(C) Iodine
(D) Chlorine
Answer: (C)

The atomic number of phosphorous is –
(A) 14
(B) 15
(C) 16
(D) 17
Answer: (B)

Which of the following is not a characteristic of metals?
(A) Ductility
(B) Brittleness
(C) Conductivity
(D) Malleability
Answer: (B)

Which organic compound is responsible for the sweet smell of ripe bananas?
(A) Amyl acetate
(B) Ethanol
(C) Acetone
(D) Butanal
Answer: (A)

What is the chemical symbol of potassium?
(A) P
(B) K
(C) Pt
(D) Po
Answer: (B)

Which of the following is a non-metal that conducts electricity?
(A) Sulfur
(B) Phosphorus
(C) Graphite
(D) Chlorine
Answer: (C)

Which of these processes is used to separate a solid that has dissolved in a liquid?
(A) Filtration
(B) Distillation
(C) Evaporation
(D) Sublimation
Answer: (C)

Which of the following forms the backbone of nucleic acids?
(A) Phosphorus
(B) Nitrogen
(C) Carbon
(D) Sulfur
Answer: (A)

Which of the following elements is used in making filaments of electric bulbs?
(A) Iron
(B) Tungsten
(C) Aluminum
(D) Nickel
Answer: (B)

Which of the following is the formula of washing soda?
(A) Na₂CO₃
(B) NaHCO₃
(C) NaOH
(D) NaCl
Answer: (A)

Which of the following compounds is used as an antiseptic?
(A) Sodium fluoride
(B) Potassium iodide
(C) Iodine
(D) Chlorine
Answer: (C)

Which of the following represents an alkene?
(A) C₂H₆
(B) C₂H₄
(C) C₂H₂
(D) CH₄
Answer: (B)

Which of the following substances is used in the manufacture of explosives?
(A) Potassium nitrate
(B) Sodium chloride
(C) Ammonium sulfate
(D) Calcium carbonate
Answer: (A)

Which metal is found in hemoglobin?
(A) Magnesium
(B) Zinc
(C) Copper
(D) Iron
Answer: (D)

Which of these is a basic salt?
(A) Na₂SO₄
(B) CH₃COONa
(C) NH₄Cl
(D) NaHSO₄
Answer: (B)

Which of these gases is used to fill fluorescent tubes?
(A) Neon
(B) Argon
(C) Helium
(D) Krypton
Answer: (B)

Which gas turns limewater milky?
(A) NH₃
(B) CO₂
(C) O₂
(D) H₂
Answer: (B)

Which metal is the best conductor of electricity?
(A) Gold
(B) Copper
(C) Aluminum
(D) Silver
Answer: (D)

Which gas is used for artificial ripening of fruits?
(A) Ethylene
(B) Acetylene
(C) Ammonia
(D) Methane
Answer: (A)

Which of the following is a thermoplastic?
(A) Bakelite
(B) Melamine
(C) PVC
(D) Urea-formaldehyde
Answer: (C)

The chemical formula of bleaching powder is –
(A) CaOCl₂
(B) CaCl₂
(C) CaCO₃
(D) Ca(OH)₂
Answer: (A)

Which of the following is an ore of iron?
(A) Bauxite
(B) Galena
(C) Hematite
(D) Malachite
Answer: (C)

Which is the most abundant gas in the atmosphere?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Argon
Answer: (C)

Which of the following shows both acidic and basic properties?
(A) HCl
(B) NaOH
(C) H₂O
(D) CH₃COOH
Answer: (C)

Which of the following is a monomer of proteins?
(A) Nucleotides
(B) Amino acids
(C) Fatty acids
(D) Glucose
Answer: (B)

Which compound is responsible for the blue color of copper sulfate?
(A) Cu²⁺
(B) SO₄²⁻
(C) H₂O
(D) Cu⁺
Answer: (A)

Which acid is used in the preservation of pickles?
(A) Oxalic acid
(B) Tartaric acid
(C) Acetic acid
(D) Lactic acid
Answer: (C)

Which metal is used in making coins?
(A) Iron
(B) Zinc
(C) Nickel
(D) Sodium
Answer: (C)

The smallest unit of an element that retains its properties is –
(A) Molecule
(B) Atom
(C) Electron
(D) Proton
Answer: (B)

Which of the following reacts with acids to release hydrogen gas?
(A) Non-metals
(B) Noble gases
(C) Metals
(D) Metalloids
Answer: (C)

Which of the following is used as a cleaning agent in household?
(A) Acetone
(B) Ammonia
(C) Alcohol
(D) All of the above
Answer: (D)

Which of these is not a characteristic of a chemical change?
(A) Change in temperature
(B) Formation of a new substance
(C) Change of state
(D) Evolution of gas
Answer: (C)

Which of these elements is a lanthanide?
(A) Cerium
(B) Zinc
(C) Lead
(D) Calcium
Answer: (A)

Which is the major component of natural gas?
(A) Methane
(B) Ethane
(C) Propane
(D) Butane
Answer: (A)

Which of these shows optical isomerism?
(A) Butane
(B) 2-Butanol
(C) Methane
(D) Ethylene
Answer: (B)

Which of the following is a biodegradable polymer?
(A) Nylon
(B) PVC
(C) PHBV
(D) Polystyrene
Answer: (C)

Which of the following does not conduct electricity?
(A) Molten NaCl
(B) Solid NaCl
(C) Aqueous NaCl
(D) Liquid NaOH
Answer: (B)

Which part of an atom has a positive charge?
(A) Electron
(B) Neutron
(C) Nucleus
(D) Shell
Answer: (C)

Which one of these causes temporary hardness of water?
(A) CaCl₂
(B) CaSO₄
(C) Ca(HCO₃)₂
(D) Ca(NO₃)₂
Answer: (C)

Which gas is known as ‘goblin gas’?
(A) Methane
(B) Ethylene
(C) Phosphine
(D) Carbon monoxide
Answer: (C)

Which of these is used in removing grease from clothes?
(A) Baking soda
(B) Soap
(C) Vinegar
(D) Alum
Answer: (B)

Which of these gives a positive Tollen’s test?
(A) Aldehyde
(B) Ketone
(C) Alcohol
(D) Ether
Answer: (A)

Which of these produces blue flame with a green edge?
(A) Barium
(B) Copper
(C) Sodium
(D) Potassium
Answer: (B)

Which acid is used in car batteries?
(A) Sulfuric acid
(B) Nitric acid
(C) Hydrochloric acid
(D) Acetic acid
Answer: (A)