2Al(s)+2NaOH(aq)+6H2O(l)⟶2A+3H2(g)Here, A is

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Na+Al(OH)4-(aq)Sodium tetrahydroxoaluminate (III)

Na2Al(OH)4-(aq)Sodium tetrahydroxoaluminate (III)

Na+Al(OH)6-(aq)Sodium hexahydroxoaluminate (II)

NaAl(OH)6-(aq)Sodium hexahydroxoalunminate (III)

answer is A.

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Detailed Solution

Aluminium reacts with aqueous alkali and liberates dihydrogen.2Al(s)+2NaOH(aq)+6H2O(l)⟶2Na+Al(OH)4-(aq)+3H2(g) Sodium tetrahydroxoaluminate(III)