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

A) oxygen and hydrogen

B) hydrogen

C) hydrogen and helium

D) helium

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

A) p-orbital overlaps with another p-orbital

B) s-orbital overlaps with another s-orbital

C) p-orbital overlaps with a s-orbital

D) d-orbital overlaps with f-orbital

MCQ 1198: Collision theory helps to explain the effects of

A) concentration

B) temperature

C) surface area

D) all of above

MCQ 1199: Sodium reacts vigorously with

A) water

B) metals

C) gases

D) none of above

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

A) Ca(OH)₂

B) Mg(OH)₂

C) MgO

D) CaO

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