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Periodic Table and Periodicity question

2023 · 13 Apr · Shift 1 · Q2
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Periodic Table and Periodicity question

2023 · 13 Apr · Shift 1 · Q2

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Which of the following statements are not correct? A. The electron gain enthalpy of F\mathrm{F}F is more negative than that of Cl\mathrm{Cl}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\mathrm{Al}_{2} \mathrm{O}_{3}Al2​O3​ and NO\mathrm{NO}NO are examples of amphoteric oxides. Choose the most appropriate answer from the options given below :
  1. A
    A, B, C and D
  2. B
    A, C and D Only
  3. C
    A, B and D Only
  4. D
    B and D Only
View written solutionFree

Correct answer: INCORRECT STATEMENTS: A AND D ONLY, THE OPTIONS SEEM MISPRINTED; STORED ANSWER B IS NOT CORRECT BECAUSE STATEMENT C IS TRUE.

  1. We need to identify the incorrect statements among A, B, C, and D.

  1. Statement A:

    "The electron gain enthalpy of F\mathrm{F}F is more negative than that of Cl\mathrm{Cl}Cl."

    This is incorrect.

    • Although fluorine is more electronegative, the added electron enters the very small 2p2p2p orbital of F, where electron-electron repulsion is high.
    • In chlorine, the electron enters the larger 3p3p3p orbital, so the process is more favorable.

    Therefore, ΔegH(Cl)<ΔegH(F)\Delta_{eg}H(\mathrm{Cl}) < \Delta_{eg}H(\mathrm{F})Δeg​H(Cl)<Δeg​H(F) in the sense that chlorine has more negative electron gain enthalpy than fluorine.

    So, A is not correct.

  1. Statement B:

    "Ionization enthalpy decreases in a group of periodic table."

    This is correct in general.

    • Down a group, atomic size increases.
    • Valence electrons are farther from the nucleus.
    • Shielding effect increases.
    • Hence less energy is required to remove an electron.

    So, ionization enthalpy generally decreases down a group.

    Therefore, B is correct.

  1. Statement C:

    "The electronegativity of an atom depends upon the atoms bonded to it."

    This is correct.

    • Electronegativity is not an absolute constant for an isolated atom.
    • It depends on the chemical environment, oxidation state, and the atoms to which it is bonded.

    Therefore, C is correct.

  1. Statement D:

    "Al2O3\mathrm{Al_2O_3}Al2​O3​ and NO\mathrm{NO}NO are examples of amphoteric oxides."

    This is incorrect.

    • Al2O3\mathrm{Al_2O_3}Al2​O3​ is indeed an amphoteric oxide.
    • But NO\mathrm{NO}NO is a neutral oxide, not amphoteric.

    Therefore, D is not correct.

  1. Thus, the incorrect statements are: A and DA \text{ and } DA and D
  1. Now compare with options:
  • Option A: A, B, C and D →\to→ wrong
  • Option B: A, C and D only →\to→ wrong
  • Option C: A, B and D only →\to→ wrong
  • Option D: B and D only →\to→ wrong

So based on standard NCERT facts, the incorrect statements should be A and D only, but that option is missing.

  1. Comparison with stored answer

Stored correct answer is B = A, C and D only.

But statement C is actually correct, so I do not agree with the stored answer.

The question/options appear to have an error because the true set of incorrect statements is A and D only, which is not listed among the options.

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