The metal used in making aircrafts due to its light weight is –
(A) Iron
(B) Lead
(C) Aluminum
(D) Zinc
Answer: (C)

Which ion imparts blue color to flame?
(A) Cu²⁺
(B) Na⁺
(C) K⁺
(D) Ba²⁺
Answer: (A)

The number of protons in O²⁻ ion is –
(A) 6
(B) 8
(C) 10
(D) 16
Answer: (B)

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

Hydrocarbons contain –
(A) Only hydrogen
(B) Only carbon
(C) Hydrogen and carbon
(D) Carbon, hydrogen, and oxygen
Answer: (C)

The hardest natural substance is –
(A) Iron
(B) Diamond
(C) Quartz
(D) Graphite
Answer: (B)

The radioactive isotope used to date fossils is –
(A) Carbon-14
(B) Uranium-238
(C) Thorium-232
(D) Iodine-131
Answer: (A)

Which is an endothermic process?
(A) Condensation
(B) Freezing
(C) Melting
(D) Combustion
Answer: (C)

The color of copper sulfate solution is –
(A) Blue
(B) Green
(C) Colorless
(D) Pink
Answer: (A)

The reaction between an acid and a metal carbonate produces –
(A) Salt and hydrogen
(B) Salt and water
(C) Salt, water, and carbon dioxide
(D) Salt and oxygen
Answer: (C)

The mass of one mole of oxygen gas (O₂) is –
(A) 16 g
(B) 32 g
(C) 8 g
(D) 18 g
Answer: (B)

The oxidation number of sulfur in SO₄²⁻ is –
(A) +4
(B) +6
(C) –2
(D) +2
Answer: (B)

The pH of a strong acid is usually –
(A) 7
(B) 1–3
(C) 4–6
(D) Above 7
Answer: (B)

What is the common name of NaCl?
(A) Caustic soda
(B) Baking soda
(C) Common salt
(D) Soda ash
Answer: (C)

The process used for refining of petroleum is –
(A) Sublimation
(B) Distillation
(C) Filtration
(D) Evaporation
Answer: (B)

The atomic number of calcium is –
(A) 12
(B) 18
(C) 20
(D) 22
Answer: (C)

The functional group in alcohols is –
(A) –COOH
(B) –OH
(C) –CHO
(D) –CO–
Answer: (B)

The process by which green plants prepare food is –
(A) Respiration
(B) Transpiration
(C) Photosynthesis
(D) Digestion
Answer: (C)

The main constituent of natural gas is –
(A) Ethane
(B) Propane
(C) Butane
(D) Methane
Answer: (D)

Which oxide of nitrogen is a greenhouse gas?
(A) NO
(B) NO₂
(C) N₂O
(D) N₂
Answer: (C)

Which part of the atom contains the most mass?
(A) Electron
(B) Nucleus
(C) Neutron cloud
(D) Electron shell
Answer: (B)

Which non-metal is a good conductor of electricity?
(A) Oxygen
(B) Chlorine
(C) Graphite
(D) Sulfur
Answer: (C)

Which is an example of a salt?
(A) HCl
(B) NaOH
(C) NaCl
(D) CH₄
Answer: (C)

Chemical formula of gypsum is –
(A) CaCO₃
(B) Ca(OH)₂
(C) CaSO₄·2H₂O
(D) CaSO₄
Answer: (C)

The total number of naturally occurring elements is –
(A) 92
(B) 94
(C) 108
(D) 120
Answer: (A)

The volume occupied by 1 mole of any gas at STP is –
(A) 22.4 mL
(B) 22.4 L
(C) 1 L
(D) 2.24 L
Answer: (B)

The compound formed when ethanol is oxidized is –
(A) Ethanoic acid
(B) Methanol
(C) Acetone
(D) Propanol
Answer: (A)

Which metal is stored under kerosene?
(A) Calcium
(B) Sodium
(C) Iron
(D) Aluminum
Answer: (B)

Which of the following shows resonance?
(A) CH₄
(B) CO₂
(C) O₃
(D) HCl
Answer: (C)

Which gas is released on heating limestone?
(A) CO
(B) O₂
(C) CO₂
(D) NO₂
Answer: (C)

Which of the following is used as a preservative in pickles?
(A) Vinegar
(B) Sodium chloride
(C) Sugar
(D) All of the above
Answer: (D)

The color of bromine is –
(A) Green
(B) Yellow
(C) Reddish-brown
(D) Violet
Answer: (C)

The formula of acetic acid is –
(A) CH₃COOH
(B) HCOOH
(C) C₂H₅OH
(D) CH₃OH
Answer: (A)

Which of the following is not a fossil fuel?
(A) Coal
(B) Petroleum
(C) Natural gas
(D) Hydrogen
Answer: (D)

Which is the heaviest particle in an atom?
(A) Electron
(B) Proton
(C) Neutron
(D) Positron
Answer: (C)

The process of separation of oil and water is –
(A) Distillation
(B) Sublimation
(C) Sedimentation
(D) Decantation
Answer: (D)

The gas released by burning fossil fuels is –
(A) Hydrogen
(B) Oxygen
(C) Carbon dioxide
(D) Helium
Answer: (C)

The only metal that is liquid at room temperature is –
(A) Lead
(B) Zinc
(C) Mercury
(D) Chromium
Answer: (C)

The atomic number of oxygen is –
(A) 6
(B) 7
(C) 8
(D) 9
Answer: (C)

The simplest hydrocarbon is –
(A) Methane
(B) Butane
(C) Ethylene
(D) Propane
Answer: (A)

Which acid is present in apples?
(A) Acetic acid
(B) Malic acid
(C) Tartaric acid
(D) Oxalic acid
Answer: (B)

The product of reaction between acid and base is –
(A) Salt only
(B) Water only
(C) Salt and water
(D) Salt and gas
Answer: (C)

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

Which of the following is a greenhouse gas?
(A) SO₂
(B) CO
(C) CO₂
(D) H₂
Answer: (C)

The metal with highest melting point is –
(A) Tungsten
(B) Iron
(C) Copper
(D) Aluminum
Answer: (A)

The main constituent of LPG is –
(A) Methane
(B) Butane
(C) Ethane
(D) Acetylene
Answer: (B)

The salt formed in the reaction of HCl with NaOH is –
(A) NaCl
(B) NaOH
(C) H₂O
(D) H₂
Answer: (A)

The atomic number of hydrogen is –
(A) 0
(B) 1
(C) 2
(D) 3
Answer: (B)

Which vitamin is produced in skin by sunlight?
(A) A
(B) B
(C) C
(D) D
Answer: (D)

Which gas is known as ‘marsh gas’?
(A) CO₂
(B) NH₃
(C) CH₄
(D) H₂S
Answer: (C)