Skip to Main Content

Home Categories

Quiz Builder

Free quiz building from a large question library, with custom questions and first-party online play.

Pro

AI quiz building, image questions, private quizzes, and advanced export workflows for serious creators.

API

Authenticated API access for builders creating their own quiz apps, workflows, and integrations.

Color scheme

© QuestionStock

Library snapshot4,089 questions30 categories

All systems operational

Categories Features Quiz Builder Pro API

About Pricing Quizzes Support Contact

Status API docs Terms Privacy

In a limestone-based wet flue-gas desulfurization (FGD) s... | QuestionStock

Representative image for question: In a limestone-based wet flue-gas desulfurization (FGD) system, which oxidant is commonly used to convert calcium sulfite into gypsum (calcium sulfate dihydrate)?

Categories
Environment

In a limestone-based wet flue-gas desulfurization (FGD) system, which oxidant is commonly used to convert calcium sulfite into gypsum (calcium sulfate dihydrate)?

Hard

Create a free account to see more questions and build your own quiz.

In a limestone-based wet flue-gas desulfurization (FGD) system, which oxidant is commonly used to convert calcium sulfite into gypsum (calcium sulfate dihydrate)?

Options:

Air (oxygen)
Chlorine gas
Ozone
Hydrogen peroxide

Correct answer: Air (oxygen)

Explanation: Forced-oxidation wet FGD systems use air (molecular oxygen) to oxidize calcium sulfite to gypsum (CaSO4·2H2O); this air-oxidation approach became standard in many commercial FGD installations since the 1970s.

Created 2026-03-10T17:16:10.632Z. Updated 2026-03-10T17:16:10.632Z.