Chemistry, asked by isabelumaru, 9 months ago

Which of the following reactions involves the combination of two elements?
A. CaO + CO2 -> CaCO3
B. 4Na + O2 -> 2Na2O
C. SO2 +(1/2)O2 -> SO3
D. NH3 + HCI -> NH4CI

Answers

Answered by anjaligudia
4

Answer:

b. Na and O2 are both elements

Answered by neelimaravikumar2010
4

The answer is B

As Na and O are elements....

Hope it helps...

Pls mark as BRAINLIEST....

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