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Friday, 9 October

NEET UG 2019 · Chemistry · Question 81

NEET 2019 Chemistry, question 81

Question 81 of the NEET 2019 paper (code P1) is a Chemistry question from The p-Block Elements (Class 11). Its idea, Hydrolysis Mechanism of SiCl4 vs CCl4, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.

Updated 2026-10-08

Q81 · Chemistry

Which of the following species is not stable ?

  1. 1[SiF6]2−[SiF_6]^{2-}
  2. 2[GeCl6]2−[GeCl_6]^{2-}
  3. 3[Sn(OH)6]2−[Sn(OH)_6]^{2-}
  4. 4[SiCl6]2−[SiCl_6]^{2-}Official answer

Official answer: option 4 · NTA final answer key

Same idea

The only question on Hydrolysis Mechanism of SiCl4 vs CCl4

No other NEET paper from 2017–2026 tested this exact idea.

Hydrolysis Mechanism of SiCl4 vs CCl4: every question and how it was framed

The chapter

The p-Block Elements (Class 11) in ten years of NEET

13 questions from 2017–2026, asked in 7 of 10 papers, about 1.3 a paper. p-Block (Group 13-14) alone had 12.

Chapter analysis

The p-Block Elements (Class 11): questions per paper

0241’172’182’192’200’212’222’230’240’252’26