The gas released during photosynthesis is – (A) CO₂ (B) O₂ (C) H₂ (D) N₂ Answer: (B)
The common name of NaOH is – (A) Baking soda (B) Washing soda (C) Caustic soda (D) Soda ash Answer: (C)
Which acid is used in car batteries? (A) Nitric acid (B) Hydrochloric acid (C) Sulfuric acid (D) Acetic acid Answer: (C)
Which hydrocarbon is saturated? (A) Ethylene (B) Acetylene (C) Methane (D) Benzene Answer: (C)
Which metal is used to galvanize iron? (A) Zinc (B) Tin (C) Copper (D) Lead Answer: (A)
Dry ice is – (A) Solid CO₂ (B) Frozen N₂ (C) Solid O₂ (D) Iced water Answer: (A)
The indicator that turns pink in base is – (A) Methyl orange (B) Phenolphthalein (C) Litmus (D) Universal indicator Answer: (B)
The formula of quicklime is – (A) CaCO₃ (B) Ca(OH)₂ (C) CaO (D) CaCl₂ Answer: (C)
The SI unit of concentration is – (A) g/L (B) mol/L (C) ppm (D) % Answer: (B)
Allotropy is – (A) Same element, same form (B) Different elements, same compound (C) Same element, different forms (D) Different elements, different forms Answer: (C)
Which gas turns limewater milky? (A) CO₂ (B) NH₃ (C) HCl (D) O₂ Answer: (A)
Saponification is the process of making – (A) Alcohol (B) Soap (C) Ether (D) Vinegar Answer: (B)
Which vitamin is water-soluble? (A) A (B) D (C) B-complex (D) K Answer: (C)
The common ore of aluminum is – (A) Bauxite (B) Hematite (C) Malachite (D) Galena Answer: (A)
The IUPAC name of CH₄ is – (A) Methene (B) Methyne (C) Methanol (D) Methane Answer: (D)
The gas used in balloons is – (A) Hydrogen (B) Oxygen (C) Helium (D) Carbon dioxide Answer: (C)
The formula of marble is – (A) CaO (B) CaCO₃ (C) Ca(OH)₂ (D) CaCl₂ Answer: (B)
Which is not a greenhouse gas? (A) CH₄ (B) CO₂ (C) H₂ (D) O₃ Answer: (C)
The functional group –OH represents – (A) Aldehyde (B) Alcohol (C) Carboxylic acid (D) Ester Answer: (B)
The number of covalent bonds in N₂ molecule is – (A) 1 (B) 2 (C) 3 (D) 4 Answer: (C)
The SI unit of heat is – (A) Calorie (B) Erg (C) Joule (D) Watt Answer: (C)
The pH of lemon juice is approx – (A) 2 (B) 4 (C) 6 (D) 7 Answer: (A)
The chemical used in water purification is – (A) Alum (B) Bleach (C) Salt (D) Baking soda Answer: (A)
Which element is used in thermometers? (A) Lead (B) Mercury (C) Iron (D) Zinc Answer: (B)
The nuclear charge is experienced by – (A) Electrons (B) Protons (C) Neutrons (D) Photons Answer: (A)
The symbol of lead is – (A) L (B) Pl (C) Pb (D) Pd Answer: (C)
The oxidation state of carbon in CO₂ is – (A) 0 (B) +2 (C) +4 (D) –2 Answer: (C)
Which compound is used in photography? (A) AgNO₃ (B) NaCl (C) CuSO₄ (D) KCl Answer: (A)
The tetravalency of carbon is due to – (A) Small size (B) Hybrid orbitals (C) 4 valence electrons (D) Large mass Answer: (C)
Aromatic compounds must contain – (A) Carbon (B) A benzene ring (C) Oxygen (D) Sulfur Answer: (B)
The catalyst in Haber process is – (A) Platinum (B) Copper (C) Iron (D) Nickel Answer: (C)
Which substance sublimes on heating? (A) Ice (B) Camphor (C) Sugar (D) Salt Answer: (B)
The metal that can be cut with a knife is – (A) Iron (B) Zinc (C) Sodium (D) Copper Answer: (C)
The most abundant element in the universe is – (A) Helium (B) Carbon (C) Hydrogen (D) Oxygen Answer: (C)
Which gas has a pungent smell? (A) CO₂ (B) O₂ (C) NH₃ (D) N₂ Answer: (C)
The basis of modern periodic table is – (A) Mass number (B) Atomic mass (C) Atomic number (D) Isotopic mass Answer: (C)
The charge on a proton is – (A) 0 (B) –1 (C) +1 (D) +2 Answer: (C)
The natural source of acid rain is – (A) Lightning (B) Sea salt (C) Forest fire (D) Volcano Answer: (D)
Which is a biodegradable polymer? (A) Nylon (B) Polyethylene (C) Starch (D) PVC Answer: (C)
Which metal does not corrode easily? (A) Zinc (B) Iron (C) Gold (D) Silver Answer: (C)
Which bond forms between water molecules? (A) Covalent (B) Ionic (C) Hydrogen bond (D) Metallic Answer: (C)
Which acid is used to remove rust? (A) Hydrochloric acid (B) Citric acid (C) Sulfuric acid (D) Acetic acid Answer: (A)
The most common reducing agent is – (A) H₂ (B) O₂ (C) CO₂ (D) NaCl Answer: (A)
The process of coating iron with zinc is – (A) Tinning (B) Galvanization (C) Electroplating (D) Alloying Answer: (B)
The pH of blood is approx – (A) 4.5 (B) 5.5 (C) 7.4 (D) 8.4 Answer: (C)
The green coating on copper is – (A) Copper oxide (B) Copper sulfate (C) Basic copper carbonate (D) Copper chloride Answer: (C)
The anion present in bleaching powder is – (A) Cl⁻ (B) OCl⁻ (C) CO₃²⁻ (D) OH⁻ Answer: (B)
The study of rates of reactions is – (A) Thermodynamics (B) Kinetics (C) Electrochemistry (D) Biochemistry Answer: (B)
The electrode where oxidation occurs is – (A) Anode (B) Cathode (C) Electrolyte (D) Salt bridge Answer: (A)
Litmus solution is extracted from – (A) Lichens (B) Mushrooms (C) Fungi (D) Plants Answer: (A)
