WorksheetsClassification Criteria and Color Overview
Total questions: 10
Worksheet time: 5mins
Which factors primarily determine whether hydrogen is classified as high‑carbon or low‑carbon in industrial production?
Electrolyzer voltage and plant location
End‑use sector and export destination
Method of production and feedstock source
Storage pressure and pipeline diameter
Which set best matches the color‑coded naming convention used to describe hydrogen types?
Cold, warm, neutral, vivid, muted
Pastel, neon, primary, secondary, tertiary
Silver, gold, bronze, black, rainbow
Green, blue, grey, brown, other colors
Which statement best describes green hydrogen production?
Hydrogen is extracted from oil using catalytic cracking
Coal is gasified to produce synthesis gas and hydrogen
Methane is converted to hydrogen using steam reforming
Water is split into hydrogen and oxygen via electrolysis
A project aims to minimize lifecycle CO2 while producing hydrogen from natural gas. Which combination of process and technology fits this aim?
Steam Methane Reforming with Carbon Capture and Storage
Electrolysis powered by grid electricity without renewables
Auto Thermal Reforming without any CO2 capture
Partial oxidation followed by venting of produced CO2
Compared with blue hydrogen, what is the key differentiator that makes green hydrogen the cleanest low‑carbon option?
Stores hydrogen in underground caverns after production
Uses renewable electricity so no CO2 by‑product
Employs high‑temperature reactors with catalysts
Relies on methane feedstock with captured CO2
Which process most commonly produces grey hydrogen and releases CO2 directly into the atmosphere?
Biomass gasification with CCS
Auto thermal reforming with full CO2 capture
Steam methane reforming without CCUS
Electrolysis with renewable electricity
Brown (or black) hydrogen is primarily generated from which feedstock and via which conversion route?
Natural gas via steam reforming
Coal or lignite via gasification
Water via alkaline electrolysis
Biogas via partial oxidation
A facility aims to minimize atmospheric carbon releases while producing hydrogen. Which change most effectively addresses the environmental damage described?
Vent CO and CO2 through taller stacks
Increase methane splitting temperature slightly
Add CO2 capture and storage to reforming
Switch to more efficient coal gasification
Which hydrogen category relies on nuclear heat to thermally split water at high temperature?
Turquoise hydrogen via methane pyrolysis
Pink hydrogen using nuclear plant electricity
Yellow hydrogen using solar-only electricity
Red hydrogen using nuclear thermal energy
A process yields solid carbon instead of CO2 gas. Which production route is being described?
High-temperature water catalytic splitting
Solar electrolysis of water only
Electrolysis using nuclear electricity
Methane pyrolysis producing solid carbon
