Which type of bonding exists in diamond?
(A) Ionic
(B) Metallic
(C) Covalent
(D) Hydrogen
Answer: (C)

Which of the following is an acidic salt?
(A) NaCl
(B) Na₂CO₃
(C) NaHSO₄
(D) KCl
Answer: (C)

Which chemical is used in the silvering of mirrors?
(A) Silver chloride
(B) Silver nitrate
(C) Silver bromide
(D) Silver oxide
Answer: (B)

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

Which of these is an artificial sweetener?
(A) Glucose
(B) Saccharin
(C) Fructose
(D) Sucrose
Answer: (B)

The number of atoms in one mole of a substance is –
(A) 1.602 × 10⁻¹⁹
(B) 6.022 × 10²³
(C) 3.14 × 10⁷
(D) 1.008 × 10⁶
Answer: (B)

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

Which gas has the highest solubility in water?
(A) CO₂
(B) O₂
(C) H₂
(D) N₂
Answer: (A)

What is the common name of calcium oxide?
(A) Slaked lime
(B) Quick lime
(C) Lime water
(D) Baking soda
Answer: (B)

Which compound is used in the detection of carbon dioxide?
(A) Limewater
(B) Litmus
(C) Bromine water
(D) Phenolphthalein
Answer: (A)

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

Which of the following elements is a halogen?
(A) Oxygen
(B) Sulfur
(C) Chlorine
(D) Phosphorus
Answer: (C)

Which of the following substances is added to soap to enhance its cleansing property?
(A) Sodium sulfate
(B) Sodium carbonate
(C) Sodium chloride
(D) Sodium hydroxide
Answer: (B)

Which compound is used in dry cleaning?
(A) Acetone
(B) Carbon tetrachloride
(C) Benzene
(D) Alcohol
Answer: (B)

Which acid is used in the cleaning of toilets?
(A) Hydrochloric acid
(B) Acetic acid
(C) Nitric acid
(D) Phosphoric acid
Answer: (A)

Which of these is a compound?
(A) Air
(B) Water
(C) Soil
(D) Milk
Answer: (B)

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

Which element has the smallest atomic radius?
(A) Helium
(B) Fluorine
(C) Lithium
(D) Carbon
Answer: (A)

What is the color of copper metal?
(A) Silver
(B) Grey
(C) Golden
(D) Reddish brown
Answer: (D)

Which among the following is the main component of LPG?
(A) Methane
(B) Propane
(C) Ethane
(D) Butane
Answer: (D)

Which of the following is used as a drying agent for gases?
(A) NaOH
(B) P₂O₅
(C) H₂SO₄
(D) KMnO₄
Answer: (C)

Which part of soap molecule is hydrophobic?
(A) Ionic end
(B) Hydrocarbon chain
(C) –COO⁻ group
(D) OH group
Answer: (B)

Which type of oxide is ZnO?
(A) Acidic
(B) Basic
(C) Amphoteric
(D) Neutral
Answer: (C)

Which of the following elements is liquid at room temperature?
(A) Bromine
(B) Chlorine
(C) Iodine
(D) Sulfur
Answer: (A)

The color of Fe³⁺ in aqueous solution is –
(A) Green
(B) Brown
(C) Yellow
(D) Blue
Answer: (C)

Which of these acts as a nucleophile?
(A) H⁺
(B) NH₃
(C) Cl₂
(D) NO₂⁺
Answer: (B)

Which of the following is used to prevent rusting of iron?
(A) Zinc coating
(B) Painting
(C) Oiling
(D) All of the above
Answer: (D)

The melting point of ice is –
(A) 0°F
(B) 273 K
(C) 100°C
(D) –273°C
Answer: (B)

Which of the following is an endothermic reaction?
(A) Combustion
(B) Respiration
(C) Photosynthesis
(D) Neutralization
Answer: (C)

Which one of the following is an ore of aluminum?
(A) Galena
(B) Bauxite
(C) Hematite
(D) Magnetite
Answer: (B)

Which organic compound contains a hydroxyl group?
(A) CH₄
(B) CH₃OH
(C) CH₃COOH
(D) CH₃CHO
Answer: (B)

The atomic number of gold is –
(A) 79
(B) 80
(C) 81
(D) 78
Answer: (A)

The boiling point of water at sea level is –
(A) 90°C
(B) 100°C
(C) 110°C
(D) 80°C
Answer: (B)

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

Which among the following is used in making pencils?
(A) Lead
(B) Graphite
(C) Charcoal
(D) Coal
Answer: (B)

Which type of reaction is represented by: AB → A + B?
(A) Combination
(B) Decomposition
(C) Displacement
(D) Double displacement
Answer: (B)

What is the chemical formula of gypsum?
(A) CaSO₄
(B) CaSO₄·2H₂O
(C) Ca(OH)₂
(D) CaCl₂
Answer: (B)

Which is the major component of bone and teeth?
(A) CaCO₃
(B) CaSO₄
(C) Ca₃(PO₄)₂
(D) Ca(OH)₂
Answer: (C)

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

Which one of the following is not used as a fuel?
(A) Methane
(B) Ethanol
(C) Hydrogen
(D) Nitrogen
Answer: (D)

Which of the following elements has the highest melting point?
(A) Iron
(B) Platinum
(C) Tungsten
(D) Lead
Answer: (C)

Which process is used to obtain pure crystals of a substance from its solution?
(A) Filtration
(B) Decantation
(C) Crystallization
(D) Sedimentation
Answer: (C)

The process of solid directly converting to gas is called –
(A) Condensation
(B) Evaporation
(C) Sublimation
(D) Boiling
Answer: (C)

Which of these is used to make bulletproof glass?
(A) Acrylic
(B) Polycarbonate
(C) Silica
(D) PVC
Answer: (B)

Which gas is evolved during electrolysis of water?
(A) H₂
(B) O₂
(C) CO₂
(D) Both H₂ and O₂
Answer: (D)

Which of the following is a hydrocarbon?
(A) CH₄
(B) CO₂
(C) NaCl
(D) NH₃
Answer: (A)

Which element is used in the making of solar cells?
(A) Silicon
(B) Zinc
(C) Copper
(D) Silver
Answer: (A)

Which of the following forms the basis of organic chemistry?
(A) Oxygen
(B) Nitrogen
(C) Carbon
(D) Hydrogen
Answer: (C)

Which element has the chemical symbol ‘Sn’?
(A) Silver
(B) Tin
(C) Sodium
(D) Strontium
Answer: (B)

Which of the following is responsible for the formation of acid rain?
(A) SO₂ and NO₂
(B) CO and CO₂
(C) H₂ and O₂
(D) N₂ and H₂
Answer: (A)