IGCSE O Level Chemistry MCQs - Chapter 3

Chemical Formulae and Equations Quiz Questions and Answers PDF - 7

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Chemical Formulae & Equations Questions & Answers PDF Download: MCQ Quiz 7

MCQ 31: The formula of Hydrogen Carbonate ion is

A) HCO₂

B) HCO₃

C) HCO₄

D) H₂CO₃

MCQ 32: In Na₂CO₃.10H₂O, percentage of oxygen is

A) 0.1678

B) 0.1608

C) 0.1659

D) 0.1684

MCQ 33: The formula of aluminum sulfate indicates that for

A) each ion of Al, two ions of sulphate are required

B) each ion of Al, three ions of sulphate are required

C) two ions of Al, 3 ions of sulphate are required

D) two ions of Al, three ions of sulphate are required

MCQ 34: All of these ions have a valency of +2 except

A) Pb

B) Ca

C) Zn

D) NH₄

MCQ 35: A water molecule will always contain

A) 11% of oxygen and 89% of hydrogen

B) 18% of oxygen and 88% of hydrogen

C) 11.11% of oxygen and 88.89% of hydrogen

D) 15% of oxygen

IGCSE O Level Chemistry Mock Tests

Redox Reactions MCQs

Energy from Chemicals MCQs

Elements, Compounds and Mixtures MCQs

Speed of Reaction MCQs

Methods of purification MCQs

Salts and Identification of Ions and Gases MCQs

Particles of Matter MCQs

Acids and Bases MCQs

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