ECAT Chemistry — Transition Elements
Transition Elements is part of the Chemistry section of the UET ECAT (30 of the 100 MCQs). It breaks into 2 subtopics, and we hold 20 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Transition Elements is tested
Across the 7 ECAT past papers on ParhaiKrlo, Transition Elements accounts for 10 questions. It appears in 5 of them, about 2 questions a paper. The heaviest was ECAT Past Paper 07, with 3 questions.
| Paper | Questions |
|---|---|
| ECAT Past Paper 07 | 3 |
| ECAT Past Paper 06 | 2 |
| ECAT Past Paper 05 | 2 |
| ECAT Past Paper 04 | 2 |
| ECAT Past Paper 02 | 1 |
Transition Elements MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 07 · Transition Elements
The 'B' sub-groups of the periodic table contain the:
- A.Alkali metals
- B.Noble gases
- C.Transition elements
- D.Halogens
Show answer
Answer: C. Transition elements — In the old A/B labelling, the B sub-groups are the d-block transition elements.
- Q2 · ECAT Past Paper 06 · Transition Elements
Steel is manufactured by the open-hearth process from:
- A.Wrought iron
- B.Cast iron and steel scrap (with some iron ore)
- C.Bauxite
- D.Coke only
Show answer
Answer: B. Cast iron and steel scrap (with some iron ore) — The open-hearth charge is pig (cast) iron and steel scrap, with iron ore to oxidise the excess carbon.
- Q3 · ECAT Past Paper 05 · Transition Elements
The colour of [Ti(H₂O)₆]³⁺ is:
- A.Yellow
- B.Violet
- C.Green
- D.Orange
Show answer
Answer: B. Violet — Ti³⁺ (3d¹) absorbs yellow-green light (d–d transition), so the complex looks violet/purple.