IGCSE O Level Chemistry Certification MCQs – Practice Test 19 (Chapter 3)

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Chemical Formulae & Equations Exam Questions and Answers PDF Download: Test 19

MCQ 91: Law of conservation of mass ensures that the number of atoms of elements before and after the reaction is:

same
different
varies
none of above

MCQ 92: If an acid reacts with an oxide, the product will include H₂O and:

a salt(s)
an acid (l)
a base
a gas

MCQ 93: While writing ionic equations,:

ions actively involved in chemical change are written down only
spectator ions may be omitted only
only spectator ions are written down
ions actively involved in chemical change are written down and spectator ions may be omitted

MCQ 94: In KHCO₃, the highest percentage composition is of:

Oxygen
Potassium
Carbon
Hydrogen

MCQ 95: Valency of all of these ions is +1, except:

Ag
Cu
NH₄
Fe

IGCSE O Level Chemistry Quiz App & e-Book – Chemical Formulae & Equations Certification Guide

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Chemical Formulae and Equations MCQs

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