Compound effect

eleventh-grade chemistry:

▎Electron Configuration of Diatomic Molecules

1. Which of the following diatomic molecules has the electron configuration of 1s² 2s² 2p²?
– A) O₂
– B) C₂
– C) N₂
– D) F₂

2. What is the bond order of the molecule O₂?
– A) 1
– B) 2
– C) 3
– D) 4

3. Which of the following molecules is paramagnetic?
– A) N₂
– B) O₂
– C) F₂
– D) He₂

4. The electron configuration for N₂ is:
– A) 1s² 2s² 2p³
– B) 1s² 2s² 2p⁴
– C) 1s² 2s² 2p⁵
– D) 1s² 2s² 2p⁶

5. Which of the following statements is true about diamagnetic substances?
– A) They have unpaired electrons.
– B) They are attracted to a magnetic field.
– C) They have all paired electrons.
– D) They exhibit strong magnetism.

▎Chemical Bonding Theories

6. Which theory explains the formation of covalent bonds through the overlap of atomic orbitals?
– A) VSEPR Theory
– B) Valence Bond Theory
– C) Molecular Orbital Theory
– D) Ionic Bonding Theory

7. In molecular orbital theory, which type of bond results from the head-on overlap of orbitals?
– A) Pi bond
– B) Sigma bond
– C) Delta bond
– D) Gamma bond

8. What type of hybridization occurs in CH₄?
– A) sp
– B) sp²
– C) sp³
– D) sp³d

9. How many sigma and pi bonds are present in the molecule C₂H₄?
– A) 6 sigma, 0 pi
– B) 4 sigma, 2 pi
– C) 5 sigma, 1 pi
– D) 3 sigma, 3 pi

10. The hybridization of the central atom in NH₃ is:
▪ A) sp
▪ B) sp²
▪ C) sp³
▪ D) dsp²

▎Types of Overlapping of Orbitals

11. What type of overlap occurs when two p orbitals form a pi bond?
– A) Side-to-side overlap
– B) End-to-end overlap
– C) Hybrid overlap
– D) None of the above

12. In which molecule is a double bond present?
– A) H₂
– B) N₂
– C) O₂
– D) Cl₂

13. Which type of bond involves the sharing of one pair of electrons?
– A) Triple bond
– B) Double bond
– C) Single bond
– D) Quadruple bond

14. In a molecule with sp hybridization, how many sigma bonds can be formed?
– A) 1
– B) 2
– C) 3
– D) 4

15. The total number of sigma bonds in a molecule with a triple bond and two single bonds is:
– A) 3
– B) 4
– C) 5
– D) 6

▎Hybridization and Bonding Characteristics

16. Which of the following molecules exhibits sp² hybridization?
– A) C₂H₆
– B) C₂H₄
– C) C₂H₂
– D) CH₄

17. The bond angle in an sp hybridized molecule is approximately:
– A) 90°
– B) 120°
– C) 180°
– D) 109.5°

18. What is the hybridization of the central atom in SF₆?
– A) sp
– B) sp²
– C) sp³
– D) sp³d²

19. Which molecule has a linear geometry due to its hybridization?
– A) CO₂
– B) H₂O
– C) NH₃
– D) CH₄

20. The bond order for a molecule with two sigma bonds and one pi bond is:
– A) 1
– B) 1.5
– C) 2
– D) 3

▎Advanced Concepts in Bonding

21. Which of the following statements about molecular orbital theory is incorrect?
– A) Electrons in molecular orbitals are delocalized.
– B) Molecular orbitals can be bonding or antibonding.
– C) Molecular orbital theory only applies to diatomic molecules.
– D) Bond order can be calculated using molecular orbital theory.

22. In molecular orbital theory, which orbital is higher in energy than the 3s?
– A) 3p
– B) 3d
– C) 4s
– D) All of the above

23. The molecule F₂ has how many unpaired electrons in its ground state?
– A) 0
– B) 1
– C) 2
– D) 3

24. If a molecule has a bond order of zero, it means:
– A) It is stable.
– B) It cannot exist.
– C) It has no bonds.
– D) It has equal numbers of bonding and antibonding electrons.

25. The hybridization for a molecule with four regions of electron density around a central atom is:
– A) sp
– B) sp²

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