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

Which compound is commonly used in matchstick heads?
(A) Potassium chlorate
(B) Sodium nitrate
(C) Calcium carbide
(D) Potassium permanganate
Answer: (A)

The color of iodine solution in alcohol is –
(A) Yellow
(B) Red
(C) Purple
(D) Colorless
Answer: (C)

Which element is responsible for the green color of plant leaves?
(A) Iron
(B) Nitrogen
(C) Magnesium
(D) Zinc
Answer: (C)

Which gas is released when baking soda reacts with vinegar?
(A) Oxygen
(B) Hydrogen
(C) Carbon dioxide
(D) Methane
Answer: (C)

Which of the following is a physical change?
(A) Burning of coal
(B) Dissolving salt in water
(C) Rusting of iron
(D) Digestion of food
Answer: (B)

Which of these is not a greenhouse gas?
(A) Water vapor
(B) Nitrogen
(C) Methane
(D) Carbon dioxide
Answer: (B)

Which of the following is not an acid?
(A) HCl
(B) HNO₃
(C) NaOH
(D) H₂SO₄
Answer: (C)

Which organic compound group includes acetone?
(A) Alcohol
(B) Ketone
(C) Aldehyde
(D) Ester
Answer: (B)

The number of neutrons in carbon-14 is –
(A) 6
(B) 7
(C) 8
(D) 14
Answer: (C)

Which element has the highest electronegativity?
(A) Oxygen
(B) Nitrogen
(C) Fluorine
(D) Chlorine
Answer: (C)

Which of the following is a fuel gas?
(A) CO₂
(B) CO
(C) N₂
(D) O₂
Answer: (B)

The functional group of an alcohol is –
(A) –OH
(B) –COOH
(C) –CHO
(D) –CO–
Answer: (A)

Which of the following is used to cure iodine deficiency?
(A) Iodized salt
(B) Baking soda
(C) Alum
(D) Epsom salt
Answer: (A)

Which element is most reactive among halogens?
(A) Iodine
(B) Bromine
(C) Fluorine
(D) Chlorine
Answer: (C)

Which of these has a characteristic rotten egg smell?
(A) CO
(B) CO₂
(C) H₂S
(D) NH₃
Answer: (C)

Which of the following is a metalloid?
(A) Silicon
(B) Sulfur
(C) Magnesium
(D) Calcium
Answer: (A)

Which of these metals can be cut with a knife?
(A) Iron
(B) Potassium
(C) Zinc
(D) Copper
Answer: (B)

Which of the following compounds is used as a refrigerant?
(A) CO₂
(B) Ammonia
(C) O₂
(D) H₂
Answer: (B)

Which of the following has a pyramidal shape?
(A) CH₄
(B) NH₃
(C) CO₂
(D) H₂O
Answer: (B)

Which element is responsible for the strength of bones and teeth?
(A) Iron
(B) Potassium
(C) Calcium
(D) Zinc
Answer: (C)

Which of these undergoes addition reaction?
(A) Alkane
(B) Alkene
(C) Alcohol
(D) Carboxylic acid
Answer: (B)

Which gas burns with a blue flame?
(A) Methane
(B) CO₂
(C) CO
(D) O₂
Answer: (A)

Which acid is found in sour milk?
(A) Acetic acid
(B) Lactic acid
(C) Oxalic acid
(D) Citric acid
Answer: (B)

Which of the following is a molecular solid?
(A) Diamond
(B) Ice
(C) NaCl
(D) Fe
Answer: (B)

Which of the following is the correct formula for calcium phosphate?
(A) CaPO₄
(B) Ca₂(PO₄)
(C) Ca₃(PO₄)₂
(D) Ca(PO₄)₃
Answer: (C)

The ore of mercury is –
(A) Cinnabar
(B) Galena
(C) Hematite
(D) Bauxite
Answer: (A)

The process of loss of electrons is called –
(A) Oxidation
(B) Reduction
(C) Neutralization
(D) Sublimation
Answer: (A)

Which ion is present in acids?
(A) OH⁻
(B) Cl⁻
(C) H⁺
(D) Na⁺
Answer: (C)

Which part of the periodic table contains the transition metals?
(A) Group 1
(B) Group 2
(C) Groups 3–12
(D) Group 18
Answer: (C)

Which element is used in the galvanization of iron?
(A) Copper
(B) Zinc
(C) Nickel
(D) Tin
Answer: (B)

Which of the following compounds is used in medicine as an antiseptic?
(A) NaCl
(B) CH₃COOH
(C) Iodine
(D) CaCO₃
Answer: (C)

Which compound is used in the manufacture of soft drinks?
(A) Na₂CO₃
(B) CO₂
(C) NH₃
(D) Cl₂
Answer: (B)

The pH of gastric juice in the stomach is –
(A) 1–2
(B) 4–5
(C) 6–7
(D) 8–9
Answer: (A)

Which of the following is a thermosetting plastic?
(A) Polythene
(B) Bakelite
(C) PVC
(D) Nylon
Answer: (B)

Which compound is used in laboratory as a drying agent?
(A) CaCl₂
(B) NaCl
(C) NH₄Cl
(D) KCl
Answer: (A)

Which vitamin helps in calcium absorption?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
(D) Vitamin D
Answer: (D)

Which of these causes blue-green stains in copper vessels?
(A) Copper oxide
(B) Copper sulfate
(C) Copper carbonate
(D) Copper nitrate
Answer: (C)

Which of the following is used in perfumes and flavoring agents?
(A) Ester
(B) Alcohol
(C) Acid
(D) Aldehyde
Answer: (A)

Which of the following is a natural fiber?
(A) Nylon
(B) Rayon
(C) Wool
(D) Polyester
Answer: (C)

The common name for magnesium sulfate is –
(A) Baking soda
(B) Washing soda
(C) Epsom salt
(D) Alum
Answer: (C)

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

Which of these is an inert gas?
(A) Hydrogen
(B) Oxygen
(C) Neon
(D) Nitrogen
Answer: (C)

Which of these is a basic oxide?
(A) SO₂
(B) CO₂
(C) CaO
(D) SiO₂
Answer: (C)

Which of these helps prevent rancidity in food?
(A) Preservatives
(B) Refrigeration
(C) Antioxidants
(D) Salt
Answer: (C)

The process of coating iron with zinc is called –
(A) Alloying
(B) Galvanization
(C) Tempering
(D) Tinning
Answer: (B)

Which element is used in the control rods of nuclear reactors?
(A) Uranium
(B) Boron
(C) Plutonium
(D) Thorium
Answer: (B)

The number of protons in an atom of carbon is –
(A) 6
(B) 7
(C) 8
(D) 12
Answer: (A)

Which of these is a conductor in solid and molten state?
(A) Diamond
(B) NaCl
(C) Graphite
(D) Mg
Answer: (D)

Which of the following is not a property of ionic compounds?
(A) High melting point
(B) Good conductor in solid state
(C) Soluble in water
(D) Forms crystal lattice
Answer: (B)