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UPSC 2001: Consider the following statements with reference to the Periodic Table of chemical elements: I. Ionisation potential gradually decreases along a period. II. In a group of elements, electron affinity decreases as the atomic weight increases. III. In a given period, electronegativity decreases as the atomic number increases. Which of these statement(s) is/are correct?
(a)I only
(b)II only
(c)I and III
(d)II and III
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Not attemptedCorrect Answer: (b) II only
Across a period, effective nuclear charge rises so ionisation potential actually increases, not decreases, and electronegativity also increases; therefore statements I and III are incorrect. Within a group, atomic size grows downwards, so electron affinity (tendency to accept an electron) generally becomes less negative, validating statement II. Hence only II is correct. ([aspireias.com](https://www.aspireias.com/upsc-general-study-10years-paper/2001?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2001 Science & Technology question?▼
The correct answer is option (b): II only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Chemistry question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2001, GS Paper 1, as Question 121. It falls under Science & Technology > Chemistry.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Chemistry?▼
UPSC has asked 53 questions from Chemistry (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.