2) Ionic bonding is expected in which of these compounds? A) Cl2 B) KF C) OF2 D) HF E) H2 3) A polar covalent bond is found in which of these compounds? A) H20 B) F2 C) NaCl D) H2 E) N2 4) The bond in Cl2 is a(n) bond. A) ionic B) nonpolar covalent C) metallic D) polar ionic E) polar covalent
The Correct Answer and Explanation is :
Answers
2) B) KF
3) A) H₂O
4) B) Nonpolar covalent
Explanation
Question 2: Ionic bonding
Ionic bonds form when one atom donates electrons to another, creating positively and negatively charged ions that are electrostatically attracted. This usually occurs between metals and nonmetals.
- Cl₂: Covalent bond between two identical nonmetals.
- KF: Ionic bond because potassium (K) is a metal that loses an electron to fluorine (F), a nonmetal that gains the electron. This forms ( K^+ ) and ( F^- ).
- OF₂: Polar covalent bond because oxygen and fluorine are nonmetals that share electrons unequally.
- HF: Polar covalent bond because hydrogen and fluorine share electrons unequally, but the bond is not ionic.
- H₂: Nonpolar covalent bond because two hydrogen atoms equally share electrons.
Thus, KF exhibits ionic bonding.
Question 3: Polar covalent bond
Polar covalent bonds occur when atoms share electrons unequally due to a difference in electronegativity.
- H₂O: Oxygen is more electronegative than hydrogen, so the shared electrons are pulled closer to oxygen, making the bond polar covalent.
- F₂: Nonpolar covalent bond because the two fluorine atoms share electrons equally.
- NaCl: Ionic bond because electrons are completely transferred from sodium to chlorine.
- H₂: Nonpolar covalent bond because electrons are shared equally between the two hydrogen atoms.
- N₂: Nonpolar covalent bond due to equal sharing of electrons between nitrogen atoms.
Thus, H₂O has a polar covalent bond.
Question 4: Bond in Cl₂
In ( Cl_2 ), two chlorine atoms share electrons equally because they have identical electronegativities. This results in a nonpolar covalent bond.
Thus, the bond in ( Cl_2 ) is nonpolar covalent.