Question

which substance is a base?
hcooh
rboh
h₂co₃
nano₃

Explanation:

Bases typically dissociate in water to release hydroxide ions ($OH^-$). $HCOOH$ is formic acid, $H_2CO_3$ is carbonic acid, and $NaNO_3$ is a salt. $RbOH$ (rubidium hydroxide) dissociates to give $Rb^+$ and $OH^-$ ions, making it a base.

Answer:

B. $RbOH$