Question

Which list of formulas represents compounds, only?

(1) CO2, H2O, NH3 (3) H2, Ne, NaCl
(2) H2, N2, O2 (4) MgO, NaCl, O2

Answer 1

Answer: its option (1)

Step-by-step explanation:

O2 is not a compound so option 2 and 4 is out, and H2 is not a compound either so option 3 is out too. So were left with option one

Answer 2

A compound has to have at least two different elements in
(1) is the only list in which each of the three symbols representations show at least two different elements