Which metal is alloyed with aluminum to make duralumin?
(A) Copper
(B) Zinc
(C) Iron
(D) Chromium
Answer: (A)

Which of the following has the highest boiling point?
(A) Water
(B) Methanol
(C) Ethanol
(D) Propanol
Answer: (A)

Which of the following gases is heavier than air?
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Carbon dioxide
Answer: (D)

Which of these substances conducts electricity in molten state but not in solid state?
(A) Copper
(B) Sodium chloride
(C) Graphite
(D) Sugar
Answer: (B)

Which element is liquid at room temperature?
(A) Bromine
(B) Iodine
(C) Chlorine
(D) Fluorine
Answer: (A)

Which of the following does not contain carbon?
(A) Methane
(B) Ethanol
(C) Sodium chloride
(D) Urea
Answer: (C)

Which compound is formed when quicklime reacts with water?
(A) CaCl₂
(B) CaCO₃
(C) Ca(OH)₂
(D) CaSO₄
Answer: (C)

Which of the following is used in making plastic?
(A) Ethene
(B) Ethyne
(C) Benzene
(D) Acetone
Answer: (A)

Which gas is used in neon lights?
(A) Neon
(B) Argon
(C) Helium
(D) Krypton
Answer: (A)

Which of the following is a trivalent element?
(A) Sodium
(B) Magnesium
(C) Aluminum
(D) Potassium
Answer: (C)

Which of the following is used to detect CO gas poisoning?
(A) Methylene blue
(B) Carboxyhemoglobin test
(C) Litmus test
(D) Iodine test
Answer: (B)

Which noble gas has the lowest atomic mass?
(A) Neon
(B) Argon
(C) Helium
(D) Krypton
Answer: (C)

The first artificial sweetener discovered was –
(A) Aspartame
(B) Saccharin
(C) Sucralose
(D) Cyclamate
Answer: (B)

The name of CH₃CH₂CH₂COOH is –
(A) Ethanoic acid
(B) Butanoic acid
(C) Propanoic acid
(D) Pentanoic acid
Answer: (B)

Which gas is used in the Haber process for ammonia synthesis?
(A) CO₂ and N₂
(B) H₂ and N₂
(C) CO and H₂
(D) N₂ and CH₄
Answer: (B)

Which compound is used in explosives?
(A) Sodium nitrate
(B) Ammonium nitrate
(C) Potassium nitrate
(D) Calcium nitrate
Answer: (B)

Which chemical compound is responsible for the pungent smell of onions?
(A) Sulfur dioxide
(B) Methanethiol
(C) Allyl propyl disulfide
(D) Hydrogen sulfide
Answer: (C)

Which organic compound has the formula C₂H₆O?
(A) Methanol
(B) Ethanol
(C) Propanol
(D) Butanol
Answer: (B)

The gas used in electric bulbs to prevent filament oxidation is –
(A) Helium
(B) Argon
(C) Oxygen
(D) Nitrogen
Answer: (B)

Which of the following is a chain-growth polymer?
(A) Starch
(B) Protein
(C) Polythene
(D) Cellulose
Answer: (C)

What type of bond is formed between NH₃ and BF₃?
(A) Covalent
(B) Coordinate
(C) Ionic
(D) Metallic
Answer: (B)

The sour taste of lemon is due to –
(A) Lactic acid
(B) Citric acid
(C) Acetic acid
(D) Tartaric acid
Answer: (B)

Which of the following is used in toothpaste to prevent cavities?
(A) Sodium chloride
(B) Potassium nitrate
(C) Sodium fluoride
(D) Calcium carbonate
Answer: (C)

The reagent used to test presence of protein is –
(A) Iodine
(B) Benedict’s
(C) Biuret
(D) Fehlings
Answer: (C)

The alloy used in making dental fillings is –
(A) Bronze
(B) Solder
(C) Amalgam
(D) Steel
Answer: (C)

Which gas is produced during incomplete combustion?
(A) CO
(B) CO₂
(C) H₂
(D) CH₄
Answer: (A)

Which among the following is not a metal?
(A) Beryllium
(B) Silicon
(C) Magnesium
(D) Aluminum
Answer: (B)

Which gas is evolved during reaction of acid with carbonate salt?
(A) CO₂
(B) O₂
(C) H₂
(D) NO₂
Answer: (A)

The blue color of CuSO₄ crystals is due to –
(A) Cu²⁺ ions
(B) SO₄²⁻ ions
(C) Water of crystallization
(D) Impurities
Answer: (C)

Which of the following dissolves gold?
(A) Hydrochloric acid
(B) Nitric acid
(C) Aqua regia
(D) Sulfuric acid
Answer: (C)

Which of these metals has the highest density?
(A) Gold
(B) Platinum
(C) Mercury
(D) Osmium
Answer: (D)

Which gas is used in weather balloons?
(A) Helium
(B) Hydrogen
(C) Oxygen
(D) Methane
Answer: (A)

The major gas found in LPG is –
(A) Methane
(B) Ethane
(C) Propane
(D) Carbon dioxide
Answer: (C)

The most electronegative element is –
(A) Oxygen
(B) Fluorine
(C) Chlorine
(D) Sulfur
Answer: (B)

Which of the following is an inert electrode?
(A) Zinc
(B) Iron
(C) Platinum
(D) Copper
Answer: (C)

In chemistry, the term “mole” refers to –
(A) Number of molecules
(B) Number of atoms
(C) 6.022 × 10²³ particles
(D) Mass of a substance
Answer: (C)

Which of the following is used in dry cleaning?
(A) Acetone
(B) Carbon tetrachloride
(C) Benzene
(D) Toluene
Answer: (B)

Which radioactive isotope is used in thyroid imaging?
(A) Iodine-131
(B) Carbon-14
(C) Uranium-238
(D) Cobalt-60
Answer: (A)

Which of the following acts as an anticoagulant in blood sample tubes?
(A) Sodium chloride
(B) Heparin
(C) Urea
(D) Glucose
Answer: (B)

Which of these is not an isomer of C₄H₁₀?
(A) n-butane
(B) isobutane
(C) 2-methylpropane
(D) Butene
Answer: (D)

Which of the following causes hardness in water?
(A) Na⁺
(B) Ca²⁺
(C) Cl⁻
(D) H⁺
Answer: (B)

The element present in all acids is –
(A) Hydrogen
(B) Oxygen
(C) Carbon
(D) Nitrogen
Answer: (A)

Which vitamin deficiency causes scurvy?
(A) Vitamin B
(B) Vitamin D
(C) Vitamin C
(D) Vitamin A
Answer: (C)

Which compound is used to soften hard water?
(A) NaCl
(B) Na₂CO₃
(C) KCl
(D) CaCl₂
Answer: (B)

Which metal has a melting point just above room temperature?
(A) Gallium
(B) Lead
(C) Mercury
(D) Zinc
Answer: (A)

Which gas is collected by the downward displacement of water?
(A) CO₂
(B) Cl₂
(C) NH₃
(D) HCl
Answer: (A)

Which of the following is not a halogen?
(A) Fluorine
(B) Iodine
(C) Bromine
(D) Oxygen
Answer: (D)

Which functional group is present in aldehydes?
(A) –COOH
(B) –OH
(C) –CHO
(D) –CO–
Answer: (C)

Which color is shown by phenolphthalein in basic solution?
(A) Pink
(B) Colorless
(C) Red
(D) Yellow
Answer: (A)

The noble gas used in fluorescent tubes is –
(A) Neon
(B) Argon
(C) Xenon
(D) Helium
Answer: (A)