Which one of the following is not an element

1.
Which one of the following is not an element

A. Oxygen

B. Hydrogen

C. Silica

D. Nitrogen

Answer» D. Nitrogen

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1.	Which one of the following is not an element
A.	Oxygen
B.	Hydrogen
C.	Silica
D.	Nitrogen
Answer» D. Nitrogen

Which one of the following is not an element

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