Which oxide does not give a pink color with p | vedclass

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Question

(D) Phenolphthalein is a pH indicator that turns pink in an alkaline medium $(pH > 8.2)$.$MgO$,$CaO$,and $K_2O$ are basic oxides that react with water

Vedclass · Accepted Answer

$Fe_2O_3$

Vedclass · Answer

(D) Phenolphthalein is a pH indicator that turns pink in an alkaline medium $(pH > 8.2)$.$MgO$,$CaO$,and $K_2O$ are basic oxides that react with water to form strong bases ($Mg(OH)_2$,$Ca(OH)_2$,and $KOH$ respectively),which turn phenolphthalein pink.$Fe_2O_3$ is an amphoteric/weakly basic oxide that is practically insoluble in water and does not produce a sufficiently high concentration of $OH^-$ ions to change the color of phenolphthalein.

Which oxide does not give a pink color with phenolphthalein in an aqueous solution?

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