by DeepWebLabs
NEET
Chemistry

Electron Affinity Ea

Low Priority
Consistency: 10%
Weightage: 2 / 20 Yrs

High-Yield Trend

1
2015
1
2010

Questions
2 MCQs

01
PYQ 2010
easy
chemistry ID: neet-201

The correct order of increasing electron affinity for the elements, O, S, F and Cl is:

1. Cl < F < O < S 2. O < S < F < Cl
3. F < S < O < Cl 4. S < O < Cl < F
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2
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3
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4
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02
PYQ 2015
easy
chemistry ID: neet-201

The formation of the oxide ion O2– (g), from the oxygen atom requires first an exothermic and then an endothermic step as shown below,
Og+e-→O-; ∆fH0=–141 kJ mol-1
O-g+e-→O2-g; ∆fH0=+780 kJ mol-1

Thus, the process of formation of O2– in the gas phase is unfavorable even though O2– is isoelectronic with neon. It is due to the fact that:

1. Electron repulsion outweighs the stability gained by achieving noble gas configuration.
2. O– ion has a comparatively smaller size than the oxygen atom.
3. Oxygen is more electronegative.
4. Addition of electrons in oxygen results in a large size of the ion.
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Preparing Electron Affinity Ea for NEET

Electron Affinity Ea is a specific sub-topic that frequently appears in the NEET examination. Understanding the underlying principles and practicing targeted questions is key to mastering this concept.

The questions compiled above are previous year questions (PYQs) directly related to Electron Affinity Ea. Practicing these specific questions helps you understand the difficulty level and the examiner's approach to this topic.

Topic Frequently Asked Questions

Is Electron Affinity Ea a high-weightage topic?

You can refer to the priority and consistency badges at the top of this page. High priority topics should be thoroughly revised multiple times before the exam.

Should I memorize the solutions?

No, it is highly recommended to understand the core concept and methodology behind each solution rather than memorizing them, as exact questions are rarely repeated, but the concepts definitely are.