Question

what product can bemeasured with bromothymol blue? h₂o h₂o₂ co₂ o₂

Explanation:

Bromothymol blue is a pH - indicator. Carbon dioxide ($CO_2$) dissolves in water to form carbonic acid ($H_2CO_3$), which changes the pH of the solution. Bromothymol blue can be used to detect this change, indicating the presence of $CO_2$. It does not react specifically with $H_2O$, $H_2O_2$, or $O_2$ in a way that can be used for their measurement in this context.

Answer:

C. $CO_2$