Examkits is a JAMB CBT practice platform that provides over 20 years of past questions, Post UTME questions, and detailed video solutions to help students prepare for their exams.

How do I practice JAMB past questions on Examkits?

You can practice JAMB past questions online, on Android, or on a desktop using the Examkits app. Just register on our website and choose your preferred device.

Does Examkits work offline?

Yes. Our Android and Windows versions support offline usage. Once downloaded and activated, no internet is required to use most of the features.

Do you offer video solutions for JAMB questions?

Yes, Examkits provides detailed video explanations for all JAMB past questions from 2000 to 2024, helping students understand how to solve each problem.

Examkits offers free practice for some subjects. However, full access requires a one-time affordable activation fee for each version of the app.

CHEMISTRY

JAMB 2023 - Question 8

Chemistry 2023 JAMB Past Questions - Question 8: X is a solid substance which evolves carbon (IV) oxide on treatment with conc H2S04- A warm solute of X also decolorizes acidified KMnO4- The solid substance X is

X is a solid substance which evolves carbon (IV) oxide on treatment with conc H2S04- A warm solute of X also decolorizes acidified KMnO4- The solid substance X is

A: methanoic acid

B: sodium hydrogentrioxo carbonate (IV)

C: ethanedioic acid

D: iron (11) trioxocarbonate (IV)

Examkit's JAMB CBT App

Practice JAMB offline with our Online, PC and Mobile App

✅ 25+ years of past questions (2000 to 2025)
✅ Video solutions and explanation to questions
✅ E-library
✅ Study by topic
✅ And more.

Correct Answer

Explanation

It should be noted that for X to liberate CO22, X must be a carbonate or an oxalate. Since X decolorizes KMnO44, X must be an oxalate. Therefore, X is H22C22O44.