IGCSE A Level Chemistry Practice Test 240

Elements and Atoms Multiple Choice Questions (MCQ) PDF - 240

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Elements and Atoms Questions and Answers PDF Download: Quiz 240

MCQ 1196: The most composition of sun is mainly

oxygen and hydrogen
hydrogen
hydrogen and helium
helium

MCQ 1197: A sigma bond (σ-bond) is formed when

p-orbital overlaps with another p-orbital
s-orbital overlaps with another s-orbital
p-orbital overlaps with a s-orbital
d-orbital overlaps with f-orbital

MCQ 1198: Collision theory helps to explain the effects of

concentration
temperature
surface area
all of above

MCQ 1199: Sodium reacts vigorously with

water
metals
gases
none of above

MCQ 1200: Excess acids in the stomach can be neutralized through

Ca(OH)₂
Mg(OH)₂
MgO
CaO

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