---
title: "Transition elements; industrial uses of 3d elements"
subject: "Engineering Chemistry"
chapter: 5
key: "semester_2/engineering_chemistry:tm-industrial-applications"
source: https://www.bctengineer.com/q/semester_2/engineering_chemistry/tm-industrial-applications
site: BCT Engineering
---

# Transition elements; industrial uses of 3d elements

Engineering Chemistry · Chapter 5: 3-d Transition Elements and their Applications

- Asked in: 2068 Bhadra, 1+2 marks
- Video: [Applications in industry of 3d transition elements, Grade12](https://www.youtube.com/watch?v=JIF5uTtWEk8) — GOLD Chemistry
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_2/engineering_chemistry/tm-industrial-applications
- Whole chapter: https://www.bctengineer.com/md/semester_2/engineering_chemistry/chapter-5

## Question

What are transition elements? List the industrial application of 3d transition elements.

## Short answer

Transition elements have a partly filled d-subshell. Industrial uses: Fe for steel and Haber catalyst; Cr for stainless steel; Ni for hydrogenation and alloys; Cu for wires, brass; Zn for galvanizing and dry cells; Ti for aircraft alloys and TiO₂ pigment; V as V₂O₅ catalyst in contact process; Mn for steel and dry cells.

## Answer

**Transition elements:** d-block elements having a partly filled d subshell in the atom or in a common ion.

#### Industrial applications of 3d elements
- **Iron:** steel and cast iron for construction, machines and vehicles; catalyst in Haber's process for NH₃.
- **Chromium:** stainless steel, chrome plating (corrosion resistance), nichrome wire.
- **Nickel:** hydrogenation catalyst for vegetable oil, electroplating, Ni–Cd batteries, alloys (nichrome, monel).
- **Copper:** electrical wires, brass and bronze, heat exchangers.
- **Zinc:** galvanising iron, brass, dry cells.
- **Titanium:** light, strong alloys in aircraft; TiO₂ as white pigment.
- **Vanadium:** V₂O₅ catalyst in the contact process for H₂SO₄; vanadium steel.
- **Manganese:** manganese steel; MnO₂ in dry cells.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Transition elements are
   A. s-block elements
   B. d-block elements with a partly filled d subshell in atom or common ion
   C. elements with no d orbitals
   D. noble gases
   Answer: B. The correct option is: d-block elements with a partly filled d subshell in atom or common ion. This follows from the answer on definition. (Key point: Definition)

2. Which catalyses Haber's process for NH3?
   A. Nickel
   B. V2O5
   C. Iron
   D. Zinc
   Answer: C. Fe is the Haber catalyst. (Key point: Haber's process)

3. Which is used for galvanising iron?
   A. Copper
   B. Titanium
   C. Nickel
   D. Zinc
   Answer: D. Zn coats iron to protect it. (Key point: Galvanising)

4. TiO2 is used industrially as
   A. a white pigment
   B. a catalyst in the contact process
   C. a hydrogenation catalyst
   D. a battery electrode
   Answer: A. Titanium dioxide is a white pigment. (Key point: Pigment)

## Related in Engineering Chemistry

- [Variable oxidation states; industrial uses of 3d elements](https://www.bctengineer.com/question.md?key=semester_2%2Fengineering_chemistry%3Avariable-ox-applications) — Engineering Chemistry, chapter 5
- [Transition elements; non-typical 3d element](https://www.bctengineer.com/question.md?key=semester_2%2Fengineering_chemistry%3Atm-not-typical) — Engineering Chemistry, chapter 5
- [Main characteristics of 3d transition elements](https://www.bctengineer.com/question.md?key=semester_2%2Fengineering_chemistry%3A3d-characteristics) — Engineering Chemistry, chapter 5
- [Why 3d elements are transition; valency characteristics](https://www.bctengineer.com/question.md?key=semester_2%2Fengineering_chemistry%3A3d-transition-valency) — Engineering Chemistry, chapter 5
- [Transition elements; why so called; 3d configurations](https://www.bctengineer.com/question.md?key=semester_2%2Fengineering_chemistry%3Atm-called-config) — Engineering Chemistry, chapter 5
- [Transition elements; oxidation states of 3d; alloys](https://www.bctengineer.com/question.md?key=semester_2%2Fengineering_chemistry%3Atm-ox-alloy) — Engineering Chemistry, chapter 5

## Related in other subjects

- [Short note: Application of 3D transformation](https://www.bctengineer.com/question.md?key=semester_5%2Fcomputer_graphics%3Ashort-note-application-3d-transformation) — Computer Graphics, chapter 4
- [Elements of transition curve](https://www.bctengineer.com/question.md?key=semester_4%2Fsurveying_ii%3Atransition-curve-elements) — Surveying II, chapter 6
- [2D and 3D mesh elements, prism layers](https://www.bctengineer.com/question.md?key=semester_7%2Fapplied_computational_fluid_dynamics%3Amesh-element-types-prism-layers) — Applied Computational Fluid Dynamics, chapter 4
- [Hurdles in industrial to information transition](https://www.bctengineer.com/question.md?key=semester_7%2Ftechnology_environment_and_society%3Ahurdles-industrial-info-transition) — Technology, Environment and Society, chapter 3