A) NaAlO2
B) H2O
C) Al2O3
D) CaSiO3
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The correct answer is B) H2O
The chemical formula for water is H2O. It is composed of two hydrogen atoms and one oxygen atom.
The other three options given are not the chemical formula for water.
NaAlO2 is the chemical formula for sodium aluminate, Al2O3 is the chemical formula for aluminum oxide and CaSiO3 is the chemical formula for wollastonite.