1. The number of valence electrons in nitrogen atom is:
A) 5
B) 3
C) 7
D) 6
✅ Answer: A) 5
2. Which of the following is an amphoteric oxide?
A) Na₂O
B) Al₂O₃
C) CO₂
D) SO₂
✅ Answer: B) Al₂O₃
3. Avogadro’s number is:
A) 6.022 × 10²²
B) 6.022 × 10²³
C) 3.011 × 10²³
D) 1.66 × 10⁻²⁴
✅ Answer: B) 6.022 × 10²³
4. The hybridization of carbon in ethene (C₂H₄) is:
A) sp
B) sp²
C) sp³
D) dsp²
✅ Answer: B) sp²
5. The pH of a neutral solution at 25°C is:
A) 5
B) 6
C) 7
D) 8
✅ Answer: C) 7
6. Which gas is used in the Haber process?
A) CO
B) CH₄
C) H₂
D) Cl₂
✅ Answer: C) H₂
7. The strongest type of chemical bond is:
A) Ionic
B) Covalent
C) Hydrogen bond
D) Coordinate bond
✅ Answer: B) Covalent
8. Which of the following is not an electrolyte?
A) NaCl
B) Glucose
C) HCl
D) KOH
✅ Answer: B) Glucose
9. Which law states that equal volumes of gases at the same temperature and pressure contain equal number of molecules?
A) Boyle’s law
B) Charles’ law
C) Avogadro’s law
D) Dalton’s law
✅ Answer: C) Avogadro’s law
10. In which block of the periodic table are transition metals placed?
A) s-block
B) p-block
C) d-block
D) f-block
✅ Answer: C) d-block
11. The formula of bleaching powder is:
A) CaOCl₂
B) CaCl₂
C) Ca(OH)₂
D) CaCO₃
✅ Answer: A) CaOCl₂
12. Which of the following has the highest electronegativity?
A) Oxygen
B) Nitrogen
C) Fluorine
D) Chlorine
✅ Answer: C) Fluorine
13. The unit of rate constant for a first-order reaction is:
A) mol⁻¹ L s⁻¹
B) s⁻¹
C) L mol⁻¹ s⁻¹
D) mol L⁻¹ s⁻¹
✅ Answer: B) s⁻¹
14. The monomer of natural rubber is:
A) Styrene
B) Ethylene
C) Isoprene
D) Butadiene
✅ Answer: C) Isoprene
15. Which of the following is a Lewis base?
A) BF₃
B) NH₃
C) H⁺
D) AlCl₃
✅ Answer: B) NH₃
16. Which of the following is not an allotrope of carbon?
A) Diamond
B) Graphite
C) Buckminsterfullerene
D) Silicon
✅ Answer: D) Silicon
17. Which metal is stored under kerosene?
A) Calcium
B) Magnesium
C) Sodium
D) Copper
✅ Answer: C) Sodium
18. The process of coating iron with zinc is known as:
A) Electroplating
B) Galvanization
C) Alloying
D) Corrosion
✅ Answer: B) Galvanization
19. The element with atomic number 17 is:
A) Sulfur
B) Fluorine
C) Chlorine
D) Phosphorus
✅ Answer: C) Chlorine
20. Which of the following is not an acid?
A) HCl
B) CH₃COOH
C) NaOH
D) H₂SO₄
✅ Answer: C) NaOH
21. In organic chemistry, the IUPAC name of CH₃CH₂OH is:
A) Ethane
B) Methanol
C) Ethanol
D) Ethanoic acid
✅ Answer: C) Ethanol
22. The bond angle in methane (CH₄) is:
A) 90°
B) 120°
C) 109.5°
D) 180°
✅ Answer: C) 109.5°
23. The chemical used for decolorizing sugar is:
A) Sulphur dioxide
B) Carbon dioxide
C) Activated charcoal
D) Sodium chloride
✅ Answer: C) Activated charcoal
24. An example of a biodegradable polymer is:
A) Nylon-6
B) PHBV
C) PVC
D) Bakelite
✅ Answer: B) PHBV
25. Which of the following is used as an antifreeze in car radiators?
A) Methanol
B) Ethanol
C) Ethylene glycol
D) Acetone
✅ Answer: C) Ethylene glycol
26. The process of formation of ATP in mitochondria is called:
A) Photosynthesis
B) Glycolysis
C) Oxidative phosphorylation
D) Fermentation
✅ Answer: C) Oxidative phosphorylation
27. Which vitamin is water-soluble?
A) Vitamin A
B) Vitamin D
C) Vitamin C
D) Vitamin E
✅ Answer: C) Vitamin C
28. The molarity of a solution is:
A) Moles of solute/Volume of solvent in liters
B) Grams of solute/Volume of solvent in liters
C) Moles of solute/Volume of solution in liters
D) Moles of solvent/Volume of solution in liters
✅ Answer: C) Moles of solute/Volume of solution in liters
29. Which of the following is a non-metal but conducts electricity?
A) Sulphur
B) Phosphorus
C) Graphite
D) Iodine
✅ Answer: C) Graphite
30. The main ore of aluminium is:
A) Cryolite
B) Bauxite
C) Magnetite
D) Galena
✅ Answer: B) Bauxite
