IGCSE O Level Chemistry Practice Test 171

Atoms and Elements Quiz PDF: Questions and Answers - 171

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Atoms & Elements Questions and Answers PDF Download: Quiz 171

MCQ 851: The most common element in the air is

hydrogen
nitrogen
oxygen
carbon

MCQ 852: Each color is associated with a particular pH in

litmus indicator
universal indicator
methyl orange indicator
Phenolphthalein indicators

MCQ 853: In Oxygen molecule (O₂), stability is gained through sharing of

one electron
two electrons
three electrons
four electrons

MCQ 854: Crystallization is used to purify

sugar only
fertilizers only
salt from solution
sugar and fertilizers

MCQ 855: The melting point of the diamond is

340 °C
3400 °C
370 °C
3700 °C

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