CSIR NET Chemical Sciences PYQs with Detailed Solutions (Part 2) | 10 Important Questions
CSIR NET Chemical Sciences 2024–2025 PYQs with Detailed Solutions (Part 2) Practicing Previous Year Questions (PYQs) is one of the most effective ways to crack the CSIR NET Chemical Sciences examination. In this article, we continue our PYQ series with another set of important concept-based questions from Physical, Organic, and Inorganic Chemistry. Question 1 Which of the following species is isoelectronic with Ne? (CSIR NET Chemical Sciences – June 2025) பின்வரும் துகள்களில் எது Ne உடன் isoelectronic ஆகும்? A) Na⁺ B) Mg²⁺ C) F⁻ D) All of the above Answer: D) All of the above Solution: Neon has 10 electrons. Na⁺ (11−1=10), Mg²⁺ (12−2=10), and F⁻ (9+1=10) all contain 10 electrons. Hence all are isoelectronic with Ne. Question 2 The hybridization of carbon in CO₂ is: (CSIR NET Chemical Sciences – December 2024) CO₂ இல் கார்பனின் hybridization என்ன? A) sp B) sp² C) sp³ D) dsp² Answer: A) sp Solution: Carbon forms two double bonds with oxygen atoms. Therefore, there are two elect...