IGCSE A Level Chemistry Practice Test 240

Elements and Atoms Multiple Choice Questions (MCQs) PDF Download - 240

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Elements and Atoms MCQ Quiz with Answers PDF Download: Test 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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