gas formation

litmus paper color change

change in temparature

change in pressure

QUESTION $5$

How could you detect the presence of $C{O}_3^{2-}$ ion?

Gas formation

Litmus paper color change

change in temparature

change in prssure

QUESTION $6$

How could you detect the presence of $S{O}_4^{2-}$ ion?

Gas formation

Litmus paper color change

Temperature change

None of the above