Selected MCQ

Current Question
Which species is paramagnetic?
  • A. (Zn^{2+})
  • B. (Sc^{3+})
  • C. (Cu^+)
  • D. (Fe^{3+})
Correct Answer: D
Explanation:
(Fe^{3+}) has five unpaired d electrons, making it strongly paramagnetic.
Related Question 1
Which species is isoelectronic with Ne?
  • A. Na⁺
  • B. Mg²⁺
  • C. F⁻
  • D. All of the above
Correct Answer: D
Explanation:
All have 10 electrons like neon.
Related Question 2
Which species has highest electronegativity?
  • A. Oxygen
  • B. Fluorine
  • C. Chlorine
  • D. Nitrogen
Correct Answer: B
Explanation:
Fluorine is most electronegative.
Related Question 3
Which species has highest oxidation state?
  • A. MnO₂
  • B. Mn₂O₇
  • C. MnO
  • D. Mn₃O₄
Correct Answer: B
Explanation:
Mn in Mn₂O₇ is +7.
Related Question 4
Which species is strongest nucleophile?
  • A. H₂O
  • B. NH₃
  • C. OH⁻
  • D. Cl⁻
Correct Answer: C
Explanation:
OH⁻ has high electron density.
Related Question 5
Which species acts as Lewis acid?
  • A. NH₃
  • B. H₂O
  • C. BF₃
  • D. OH⁻
Correct Answer: C
Explanation:
BF₃ accepts electron pair.