The substance which react with hot conc.NaOH soln.& undergoes a neutralization reaction
Al?O?
Al
Al(OH)?

The solution is as follows:

Hot conc NaOH reacts with Al2O3 as follows:

        Al2O3 + NaOH (conc) NaAlO+ H2O

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 Al2O3   reacts with  conc.NaOH  solution and under goes a neutralization  reaction.
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