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10 most difficult chem­istry riddles

A list of ten (out of 208) chemistry related questions that are the most often answered incorrectly
Chemistry quiz
What is the most common element (by mass) forming the planet Earth?
carbon
oxygen
iron
silicon
Iron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.
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Very interesting!
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Chemistry quiz