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10 most difficult chem­istry riddles

A list of ten (out of 210) chemistry related questions that are the most often answered incorrectly
Chemistry quiz
which of the following is an ore of sodium ?
greenocite
sibenite
milarite
trona
greenocite is the ore of cadmium ,sibenite is antimony,milarite is nickel,trona is sodium Na2CO3.NaHCO3.3H2O
Akhil Perla
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Very interesting!
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.
globalquiz.org
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Very interesting!
elements riddles
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Chemistry quiz