Chemistry MCQs with answers Page - 152

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Q. Which of the following has the highest ionization enthalpy?

  • (A) Lithium
  • (B) Boron
  • (C) Carbon
  • (D) Neon

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Q. The molar mass of water (H₂O) is:

  • (A) 16 g/mol
  • (B) 18 g/mol
  • (C) 20 g/mol
  • (D) 22 g/mol

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Q. Which of the following is an aromatic compound?

  • (A) Ethane
  • (B) Cyclohexane
  • (C) Benzene
  • (D) Propene

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Q. The hybridization of carbon in ethene (C₂H₄) is:

  • (A) sp
  • (B) sp²
  • (C) sp³
  • (D) dsp²

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Q. Which of the following is a strong electrolyte?

  • (A) Acetic acid
  • (B) Glucose
  • (C) NaCl
  • (D) Urea

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Q. The oxidation number of sulfur in H₂SO₄ is:

  • (A) +4
  • (B) +5
  • (C) +6
  • (D) +2

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Q. Which quantum number determines the shape of an orbital?

  • (A) Principal quantum number
  • (B) Azimuthal quantum number
  • (C) Magnetic quantum number
  • (D) Spin quantum number

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Q. The pH of a solution having H⁺ concentration 10⁻³ M is:

  • (A) 1
  • (B) 2
  • (C) 3
  • (D) 4

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Q. Which of the following gases is responsible for acid rain?

  • (A) CO₂
  • (B) O₂
  • (C) SO₂
  • (D) H₂

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Q. The geometry of NH₃ molecule is:

  • (A) Linear
  • (B) Trigonal planar
  • (C) Trigonal pyramidal
  • (D) Tetrahedral

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