Question

Give reaction-Aluminum powder is warmed with hot and concentraed caustic soda solution

Answer 1

caustic soda is NaOH
Their will be no reaction taking place as aluminium is less reactive than sodium and it cant displace sodium from sodium hydroxide.
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Answer 2

It gives Sodium meta aluminate (2NaAlO2) and hydrogen gas. The reaction is given here:

2Al + 2NaOH +2H2O ---------> 2NaAlO2 + 3H2 (g)

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