The main ore of copper is –
(A) Bauxite
(B) Malachite
(C) Hematite
(D) Galena
Answer: (B)

Which of the following has maximum number of unpaired electrons?
(A) F
(B) N
(C) O
(D) Be
Answer: (B)

Which acid is found in ant stings?
(A) Oxalic acid
(B) Formic acid
(C) Acetic acid
(D) Citric acid
Answer: (B)

Which of the following is not a noble gas?
(A) Helium
(B) Neon
(C) Argon
(D) Nitrogen
Answer: (D)

The atomic mass of chlorine is approximately –
(A) 35
(B) 35.5
(C) 36
(D) 34.5
Answer: (B)

Chemical formula of lime stone is –
(A) CaCO₃
(B) CaCl₂
(C) CaO
(D) Ca(OH)₂
Answer: (A)

Which one of the following is an acidic buffer?
(A) CH₃COOH + CH₃COONa
(B) HCl + NaCl
(C) NaOH + NaCl
(D) NH₄OH + NH₄Cl
Answer: (A)

Which is used as a refrigerant in refrigerator?
(A) Ammonia
(B) Ethylene
(C) Methanol
(D) Benzene
Answer: (A)

Which metal is alloyed with tin to make bronze?
(A) Iron
(B) Zinc
(C) Copper
(D) Lead
Answer: (C)

Which of the following is a saturated hydrocarbon?
(A) Ethene
(B) Ethyne
(C) Propane
(D) Benzene
Answer: (C)

Which gas is used for ripening of fruits?
(A) Carbon dioxide
(B) Methane
(C) Ethylene
(D) Butane
Answer: (C)

Which oxide is used in the manufacture of cement?
(A) CaO
(B) MgO
(C) Na₂O
(D) K₂O
Answer: (A)

Hydrogen peroxide is stored in –
(A) Plastic bottles
(B) Blue-colored bottles
(C) Transparent glass
(D) Iron container
Answer: (B)

Which of the following is used in water purification?
(A) Alum
(B) Copper sulfate
(C) Sodium chloride
(D) Baking soda
Answer: (A)

Who discovered the electron?
(A) Rutherford
(B) Chadwick
(C) Thomson
(D) Bohr
Answer: (C)

Which among the following is a non-electrolyte?
(A) NaCl
(B) HCl
(C) Glucose
(D) KOH
Answer: (C)

Which of the following is used in the vulcanization of rubber?
(A) Phosphorus
(B) Carbon
(C) Sulfur
(D) Silicon
Answer: (C)

What is the molar mass of NaOH?
(A) 40 g/mol
(B) 45 g/mol
(C) 42 g/mol
(D) 30 g/mol
Answer: (A)

The compound CaSO₄·2H₂O is –
(A) Quick lime
(B) Plaster of Paris
(C) Gypsum
(D) Lime water
Answer: (C)

Which element is stored in paraffin?
(A) Potassium
(B) Phosphorus
(C) Lithium
(D) Iodine
Answer: (A)

Which is the smallest particle of a compound?
(A) Atom
(B) Molecule
(C) Ion
(D) Element
Answer: (B)

An alloy of mercury with other metals is called –
(A) Solder
(B) Bronze
(C) Amalgam
(D) Duralumin
Answer: (C)

The lightest gas is –
(A) Hydrogen
(B) Oxygen
(C) Helium
(D) Nitrogen
Answer: (A)

The energy required to remove an electron from an atom is –
(A) Electron affinity
(B) Ionization energy
(C) Electronegativity
(D) Enthalpy
Answer: (B)

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

Which of the following is a base?
(A) HNO₃
(B) NaCl
(C) NaOH
(D) HCl
Answer: (C)

Brass is an alloy of –
(A) Copper and tin
(B) Copper and zinc
(C) Copper and iron
(D) Zinc and tin
Answer: (B)

What is the chemical formula of vinegar?
(A) HCl
(B) CH₃COOH
(C) HCOOH
(D) C₂H₅OH
Answer: (B)

Which is the most reactive metal?
(A) Gold
(B) Iron
(C) Sodium
(D) Platinum
Answer: (C)

Which vitamin is fat-soluble?
(A) B₁
(B) B₆
(C) C
(D) D
Answer: (D)

Which of the following is a noble gas?
(A) Nitrogen
(B) Hydrogen
(C) Krypton
(D) Oxygen
Answer: (C)

Which gas is used in fluorescent tubes?
(A) Neon
(B) Oxygen
(C) Nitrogen
(D) Carbon dioxide
Answer: (A)

The only liquid non-metal at room temperature is –
(A) Bromine
(B) Chlorine
(C) Iodine
(D) Fluorine
Answer: (A)

Which compound has a triple bond?
(A) Methane
(B) Ethene
(C) Ethyne
(D) Propane
Answer: (C)

Which is used as a moderator in nuclear reactors?
(A) Heavy water
(B) Nitrogen
(C) Graphite
(D) Both A and C
Answer: (D)

Which ion gives green flame in flame test?
(A) Ba²⁺
(B) Cu²⁺
(C) Fe²⁺
(D) Ni²⁺
Answer: (C)

The pH of blood is –
(A) 5.6
(B) 6.8
(C) 7.4
(D) 8.4
Answer: (C)

Tincture iodine is a solution of –
(A) Iodine in water
(B) Iodine in alcohol
(C) Iodine in oil
(D) Iodine in glycerine
Answer: (B)

Baking powder is a mixture of –
(A) Baking soda and citric acid
(B) Baking soda and tartaric acid
(C) Baking soda and vinegar
(D) Baking soda and HCl
Answer: (B)

Which of the following is not a greenhouse gas?
(A) CO₂
(B) CH₄
(C) N₂
(D) CFC
Answer: (C)

Which metal is used in galvanometers?
(A) Gold
(B) Silver
(C) Manganin
(D) Tin
Answer: (C)

Which of the following is a noble metal?
(A) Zinc
(B) Nickel
(C) Platinum
(D) Iron
Answer: (C)

The rate of a chemical reaction depends on –
(A) Temperature
(B) Concentration
(C) Surface area
(D) All of the above
Answer: (D)

Which one is an oxidizing agent?
(A) H₂
(B) Na
(C) Cl₂
(D) CH₄
Answer: (C)

Which element forms the backbone of organic compounds?
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Carbon
Answer: (D)

The most abundant element in the human body is –
(A) Hydrogen
(B) Calcium
(C) Carbon
(D) Oxygen
Answer: (D)

Which is a biodegradable polymer?
(A) Polythene
(B) Nylon
(C) PHBV
(D) PVC
Answer: (C)

Which acid is used to remove ink stains?
(A) Oxalic acid
(B) Acetic acid
(C) Citric acid
(D) Formic acid
Answer: (A)

The number of neutrons in tritium is –
(A) 1
(B) 2
(C) 3
(D) 0
Answer: (B)

The atomic mass of carbon is –
(A) 6
(B) 12
(C) 14
(D) 18
Answer: (B)