IGCSE O Level Chemistry MCQs – Practice Test 15 (Chapter 3)

Chemical Formulae and Equations Quiz with Answers PDF Download – Test 15

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Chemical Formulae & Equations Exam Questions and Answers PDF Download: Test 15

MCQ 71: Phosphorus can have a valency of:

2 or 4
4 or 6
3 or 5
2 or 1

MCQ 72: In magnesium oxide, magnesium ion requires only one oxygen ion because of the:

valency of oxygen is −1
valency of Oxygen is −2
valency of magnesium is +1
none of above

MCQ 73: In writing chemical equations, the inclusion of state symbols shall be done while the:

correct chemical formula of reactants and products are written
equation is being balanced to fulfill the law of conservation of mass
equation has been balanced
chemical formulae of products and reactants have been changed to bring about quick balancing

MCQ 74: Plumblum is the Latin name of:

Potassium
Lead
Copper
Valium

MCQ 75: Valency of all these ions is negative 1, except:

OH
PO₄
NO₃
Br

Chemical Formulae & Equations Quiz App & e-Book – IGCSE O Level Chemistry Study Material

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