Learn

Friday, 9 October

NEET UG 2020 · Chemistry · Question 129

NEET 2020 Chemistry, question 129

Question 129 of the NEET 2020 paper (code E1) is a Chemistry question from The p-Block Elements (Class 12). Its idea, Ammonia and the Tetraamminecopper(II) Complex, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 2.

Updated 2026-10-08

Q129 · Chemistry

Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+\mathrm{Cu^{2+}} (aq), deep blue colour solution C is formed. What is the formula of C from the following ?

  1. 1CuSO4\mathrm{CuSO_4}
  2. 2[Cu(NH3)4]2+\mathrm{[Cu(NH_3)_4]^{2+}}Official answer
  3. 3Cu(OH)2\mathrm{Cu(OH)_2}
  4. 4CuCO3⋅Cu(OH)2\mathrm{CuCO_3 \cdot Cu(OH)_2}

Official answer: option 2 · NTA final answer key

Same idea

The only question on Ammonia and the Tetraamminecopper(II) Complex

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

Ammonia and the Tetraamminecopper(II) Complex: every question and how it was framed

The chapter

The p-Block Elements (Class 12) in ten years of NEET

23 questions from 2017–2026, asked in 10 of 10 papers, about 2.2 a paper. p-Block Elements (Groups 15-18) alone had 23.

The p-Block Elements (Class 12): questions per paper

0363’171’185’192’203’212’222’232’242’251’26