Covalent bonding and dot-and-cross diagrams Quiz
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5 questions, one answer each
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1. Which is the best definition of a covalent bond?
- A. The attraction between oppositely charged ions
- B. The electrostatic attraction between two nuclei and a shared pair of electrons
- C. The transfer of an electron from one atom to another
- D. The attraction between positive ions and delocalised electrons
2. How many lone pairs are on the nitrogen atom in NH₄⁺?
- A. 2
- B. 1
- C. 3
- D. 0
3. Which statement about Al₂Cl₆ is correct?
- A. It has eight Al–Cl bonds, two of them dative
- B. It has six Al–Cl bonds, all dative
- C. It has eight Al–Cl bonds, all dative
- D. It has four Al–Cl bonds, two of them dative
4. Which row is correct for the bonds in C₂H₄ and C₂H₂, comparing the carbon–carbon bonds?
- A. C≡C is longer and weaker
- B. C≡C is shorter and weaker
- C. C≡C is longer and stronger
- D. C≡C is shorter and stronger
5. Which species contains a dative covalent bond?
- A. CH₄
- B. BF₃
- C. NH₄⁺
- D. SiH₄