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Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2025 — 29 January, Evening Shift — Question 11

First ionisation enthalpy values of first four group 15 elements are given below.

Choose the correct value for the element that is a main component of apatite family:

  1. Option A:

    1012 kJ mol−11012 \mathrm{~kJ} \mathrm{~mol}^{-1}

    Correct
  2. Option B:

    1402 kJ mol−11402 \mathrm{~kJ} \mathrm{~mol}^{-1}

  3. Option C:

    834 kJ mol−1834 \mathrm{~kJ} \mathrm{~mol}^{-1}

  4. Option D:

    947 kJ mol−1947 \mathrm{~kJ} \mathrm{~mol}^{-1}

Answer: A

Step-by-step solution

Apatite family mainly contains phosphate minerals. Thus, the main element is phosphorus.

Now consider first ionisation enthalpy values of group 15 elements, we have

N≈1402N \approx 1402

P≈1012P \approx 1012

As≈947As \approx 947

Sb≈834Sb \approx 834

Since phosphorus is the required element, its first ionisation enthalpy is 1012 kJ mol−11012\,\mathrm{kJ\,mol^{-1}}.

Answer key and solution verified before publishing.

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Exam
JEE Main 2025
Paper
29 January, Evening Shift
Subject
Chemistry
Chapter
Periodicity of Elements and Periodic Properties
Topic
Periodicity in Chemical Properties (Ionization Energy, Electron Affinity, Electronegativity)

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