Question

Which of the following statements are not correct?
A. The electron gain enthalpy of F is more negative than that of Cl.
B. Ionization enthalpy decreases in a group of periodic table.
C. The electronegativity of an atom depends upon the atoms bonded to it.
D. Al₂O₃ and NO are examples of amphoteric oxides.
Choose the most appropriate answer from the options given below:

• A. Α, B and D Only
• B. A, B, C and D
• C. B and D Only
• D. A, C and D Only

Answer 1

The Correct Option is D

Let's analyze each statement to determine which are incorrect:

1. Statement A: "The electron gain enthalpy of F is more negative than that of Cl."
   • Electron gain enthalpy refers to the energy change when an electron is added to a neutral atom. A more negative value typically indicates greater affinity for electrons.
   • Chlorine (Cl) actually has a more negative electron gain enthalpy compared to fluorine (F), despite fluorine's higher electronegativity. This is due to its smaller size, which results in electron-electron repulsion in the added electron shell of fluorine.
   • Thus, Statement A is incorrect.
2. Statement B: "Ionization enthalpy decreases in a group of the periodic table."
   • Ionization enthalpy generally decreases as you move down a group in the periodic table due to the increased atomic size and shielding effect, which makes it easier to remove an electron.
   • Statement B is correct.
3. Statement C: "The electronegativity of an atom depends upon the atoms bonded to it."
   • Electronegativity is an intrinsic property of an element and primarily depends on its atomic structure (number of protons and the distance of the valence electrons from the nucleus) rather than the atoms bonded to it. It does not significantly change when forming compounds.
   • Thus, Statement C is incorrect.
4. Statement D: "Al₂O₃ and NO are examples of amphoteric oxides."
   • Aluminum oxide (Al_2O_3) is indeed an amphoteric oxide as it can react with both acids and bases.
   • Nitric oxide (NO) is not an amphoteric oxide; it does not show basic properties.
   • Hence, Statement D is incorrect.

The incorrect statements are A, C, and D. Therefore, the correct answer is: A, C, and D Only.