- Carbon tetrafluoride, CF4, is a non-polar molecule. How many polar bonds does CF4 have in its structure?
0
1
2
4
- Is the solution of KCl acidic, basic or neutral?
acidic
basic
neutral
The Correct Answer and Explanation is :
1. Number of Polar Bonds in CF₄
Correct Answer: 4
Carbon tetrafluoride (CF₄) is a nonpolar molecule due to its tetrahedral geometry, which ensures that the bond dipoles cancel each other out. However, this does not mean that the individual bonds are nonpolar. Each C–F bond is polar because fluorine is much more electronegative than carbon, creating a partial negative charge on fluorine and a partial positive charge on carbon.
Since CF₄ has four C–F bonds, all four bonds are polar. The molecule as a whole is nonpolar because the symmetry of the tetrahedral shape causes the dipoles to cancel out.
2. Nature of KCl Solution: Acidic, Basic, or Neutral?
Correct Answer: Neutral
Explanation:
Potassium chloride (KCl) is a neutral salt formed by the combination of a strong acid (hydrochloric acid, HCl) and a strong base (potassium hydroxide, KOH). When KCl dissolves in water, it dissociates completely into potassium ions (K⁺) and chloride ions (Cl⁻):
[
\text{KCl} \rightarrow \text{K}^+ + \text{Cl}^-
]
Neither K⁺ nor Cl⁻ reacts with water to produce H⁺ (protons) or OH⁻ (hydroxide ions). Here’s why:
- K⁺ (Potassium Ion): It is the cation of a strong base (KOH) and does not hydrolyze in water. It has no significant effect on the pH of the solution.
- Cl⁻ (Chloride Ion): It is the anion of a strong acid (HCl) and similarly does not hydrolyze in water. It also does not affect the pH.
Because neither ion hydrolyzes, the solution remains neutral, with a pH of approximately 7 under standard conditions.
Summary:
- CF₄ has 4 polar bonds but is nonpolar due to its symmetrical geometry.
- KCl solution is neutral because it is formed from a strong acid and a strong base, and its ions do not interact with water to alter pH.