Question

Which compound would produce an acidic aqueous solution? Which compound would produce an acidic aqueous solution? RbH C2H2 PH3 CaH2 HF

Answer 1

Answer:

HF

Explanation:

Answer 2

Answer:  Option (e) is the correct answer.

Explanation:

A compound that will dissociate in water or an aqueous solution to give hydrogen ions($H^{+}$) is known as an acidic substance.

When RbH is dissolved in aqueous solution then it dissociates as follows.

$RbH \rightarrow Rb^{+} + H^{-}$.

$C_{2}H_{2}$ is non-polar in nature. So, it will not dissociate into ions when dissolved in an aqueous solution.

$PH_{3}$ will also remain neutral and does not dissociate into ions.  

$CaH_{2}$ when dissolved in water then it dissociates as follows.

$CaH_{2} \rightarrow Ca^{2+} + 2H^{-}$  

Whereas when HF is dissolved in aqueous solution then the reaction will be as follows.

$HF \rightarrow H^{+} + F^{-}$

Thus, we can conclude that out of the given options HF is the compound which will produce an acidic aqueous solution.