O Level Chemistry MCQs – Certification Test 660
MCQ 660: If the valency of both Calcium and Sulphate ion is 2, the formula of calcium sulfate will be:
The App: Chemical Symbols Quiz App to Study Chemical Symbols Notes, O Level Chemistry Quiz App, and 9th Grade Chemistry Quiz App for chemistry remote educational resources.
The "Chemical Symbols Quiz" App: Free O Level Chemistry App Download (iOS & Android) for chemistry online learning. Download App Store & Play Store Learning Apps with all functionalities to maximize chemistry confidence.