The process of rusting is – (A) Reduction (B) Oxidation (C) Sublimation (D) Neutralization Answer: (B)
Which is an amphoteric oxide? (A) CO₂ (B) Al₂O₃ (C) CaO (D) SO₂ Answer: (B)
The reduction agent in a redox reaction – (A) Gains electrons (B) Loses electrons (C) Remains neutral (D) Donates protons Answer: (B)
Hydrogen bonding is strongest in – (A) CH₄ (B) HCl (C) NH₃ (D) H₂S Answer: (C)
The chemical formula of lime water is – (A) CaCO₃ (B) Ca(OH)₂ (C) CaO (D) CaCl₂ Answer: (B)
A hydrocarbon with triple bond is called – (A) Alkene (B) Alkane (C) Alkyne (D) Aromatic Answer: (C)
Azeotropic mixtures are – (A) Ideal solutions (B) Constant boiling mixtures (C) Immiscible liquids (D) None of the above Answer: (B)
The oxidizing agent in a redox reaction – (A) Gains electrons (B) Loses electrons (C) Forms base (D) Reduces itself Answer: (A)
The molecular formula of benzene is – (A) C₆H₆ (B) C₆H₁₂ (C) C₅H₁₀ (D) C₇H₈ Answer: (A)
The most stable allotrope of carbon is – (A) Graphite (B) Diamond (C) Fullerene (D) Charcoal Answer: (A)
Which metal is used in barometers? (A) Copper (B) Lead (C) Mercury (D) Zinc Answer: (C)
The maximum number of electrons in an orbital is – (A) 1 (B) 2 (C) 3 (D) 4 Answer: (B)
The bond angle in water molecule is – (A) 109.5° (B) 120° (C) 104.5° (D) 180° Answer: (C)
The acid used in preservation of food is – (A) Acetic acid (B) Sulfuric acid (C) Formic acid (D) Benzoic acid Answer: (D)
The gas responsible for ozone depletion is – (A) Methane (B) Carbon dioxide (C) CFCs (D) Nitrogen Answer: (C)
A chemical reaction involving heat absorption is – (A) Exothermic (B) Endothermic (C) Neutral (D) Spontaneous Answer: (B)
The oxidation number of chlorine in NaClO₃ is – (A) +3 (B) +5 (C) +1 (D) –1 Answer: (B)
Quantum number ‘n’ represents – (A) Orbital shape (B) Orbital orientation (C) Energy level (D) Spin Answer: (C)
Transition metals show – (A) Fixed valency (B) Variable valency (C) No valency (D) Always +2 valency Answer: (B)
Which gas burns with a blue flame? (A) Hydrogen (B) Oxygen (C) Methane (D) Carbon monoxide Answer: (C)
The common name of ethanol is – (A) Methyl alcohol (B) Grain alcohol (C) Wood alcohol (D) Ethanoic acid Answer: (B)
The most reactive halogen is – (A) Fluorine (B) Chlorine (C) Bromine (D) Iodine Answer: (A)
A compound with same molecular but different structural formula is – (A) Isobar (B) Isotope (C) Isomer (D) Allotrope Answer: (C)
The mass of one mole of a substance is called – (A) Molecular weight (B) Molar volume (C) Molar mass (D) Atomic mass Answer: (C)
The substance used to neutralize acid spills is – (A) NaCl (B) Na₂CO₃ (C) NaOH (D) Baking soda Answer: (D)
The group 17 elements are known as – (A) Alkali metals (B) Alkaline earth metals (C) Noble gases (D) Halogens Answer: (D)
The alkali used in soap making is – (A) NaOH (B) Ca(OH)₂ (C) NH₄OH (D) Al(OH)₃ Answer: (A)
The gas that turns acidified potassium dichromate green is – (A) O₂ (B) CO (C) SO₂ (D) NO₂ Answer: (C)
The most abundant gas in Earth’s atmosphere is – (A) Oxygen (B) Nitrogen (C) Carbon dioxide (D) Hydrogen Answer: (B)
Which indicator is used in titration involving strong acid and strong base? (A) Methyl orange (B) Phenolphthalein (C) Litmus (D) Thymol blue Answer: (B)
The chemical formula of Epsom salt is – (A) MgCl₂ (B) MgSO₄·7H₂O (C) Mg(OH)₂ (D) Mg(NO₃)₂ Answer: (B)
The most basic oxide among the following is – (A) Na₂O (B) CO₂ (C) SO₃ (D) NO₂ Answer: (A)
Which element shows maximum number of oxidation states? (A) Oxygen (B) Iron (C) Manganese (D) Chromium Answer: (C)
The drying agent for HCl gas is – (A) CaO (B) H₂SO₄ (C) CaCl₂ (D) NaOH Answer: (C)
The monomer of PVC is – (A) Ethylene (B) Propene (C) Vinyl chloride (D) Styrene Answer: (C)
The metal used in filaments of bulbs is – (A) Platinum (B) Tungsten (C) Iron (D) Copper Answer: (B)
The first member of lanthanide series is – (A) Scandium (B) Lanthanum (C) Cerium (D) Yttrium Answer: (C)
The compound formed by mutual sharing of electrons is – (A) Covalent (B) Ionic (C) Metallic (D) Coordinate Answer: (A)
Bohr’s model explains – (A) Atomic weight (B) Electron spin (C) Line spectra of hydrogen (D) Chemical bonding Answer: (C)
The electron configuration of Na⁺ is same as – (A) Ne (B) Mg (C) K (D) Ar Answer: (A)
Which is a Lewis acid? (A) NH₃ (B) H₂O (C) BF₃ (D) OH⁻ Answer: (C)
Zeolite is used in – (A) Disinfection (B) Water softening (C) Fertilizer (D) Paint Answer: (B)
The product of photosynthesis is – (A) CO₂ (B) O₂ (C) H₂O (D) Methane Answer: (B)
The oxidation number of sulfur in H₂SO₄ is – (A) +6 (B) +4 (C) +2 (D) –2 Answer: (A)
Benedict’s reagent is used to test – (A) Proteins (B) Lipids (C) Reducing sugars (D) Starch Answer: (C)
A colloidal solution shows – (A) No scattering (B) Tyndall effect (C) Sedimentation (D) Suspension Answer: (B)
The acid used in car batteries is – (A) HCl (B) HNO₃ (C) H₂SO₄ (D) H₂CO₃ Answer: (C)
Which pair is not an isomer? (A) Ethanol and dimethyl ether (B) Butane and isobutane (C) Methanol and ethanol (D) Propanol and propanone Answer: (C)
The process of mixing metal with mercury is – (A) Soldering (B) Amalgamation (C) Alloying (D) Electrolysis Answer: (B)
The metal that burns with a dazzling white flame is – (A) Iron (B) Copper (C) Magnesium (D) Zinc Answer: (C)
