O Level Chemistry MCQs – Certification Test 67

Valency and Chemical Formula MCQ (Question 67) – Study App & e-Book Download

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MCQ 67: All of these radicals have a Valency of 2, except:

SO₄
CO₃
NH₄
MgCO₃

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O Level Chemistry MCQ App & e-Book – Valency & Chemical Formula Admission Tests

Ionic Compounds and Crystal Lattices Test 78

Kinetic Theory Test 79

Redox Reactions Test 80

Chemical Symbols Test 81

Valency and Chemical Formula Test 82

Reactants Test 83

Redox Reactions Test 84

Relative Molecular Mass Test 85

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