IGCSE O Level Chemistry Practice Test 5

Atoms and Elements Quiz Questions and Answers PDF - 5

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Atoms & Elements Questions and Answers PDF Download: Quiz 5

MCQ 21: Brass is an example of an/a

A) alloy

B) compound

C) mixture

D) element

MCQ 22: If acidified Potassium Dichromate(VI) (K₂Cr₂O₇) acts as oxidizing agent, color changes from

A) orange to red

B) orange to green

C) yellow to green

D) yellow to red

MCQ 23: A particle maybe a/an

A) atom

B) molecule

C) isotope

D) all of above

MCQ 24: If the proton (p⁺) number of an element changes, it will become a/an

A) isotope

B) another element

C) electrolyte

D) none of above

MCQ 25: Aluminum (Al) is preferred in overhead power cables because

A) it is a good conductor

B) it acts as an insulator, in case of lightening

C) it prevents accidents

D) it is lighter in weight

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