Question

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Answer 1

1.)ZnO + 2NaOH Na2ZnO2 + H2O. Zinc oxide react with sodium hydroxide to produce zincate sodium and water. This reaction takes place at a temperature of 500-600°C
.2)Sodium aluminate is also formed by the action of sodium hydroxide on elemental aluminium which is an amphoteric metal. The reaction is highly exothermic once established and is accompanied by the rapid evolution of hydrogen gas. Thereaction is sometimes written as: 2 Al + 2 NaOH + 2 H2O → 2 NaAlO2 + 3 H.

Answer 2

Hello friend

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I. When zinc oxide reacts with sodium hydroxide then it forms sodium zincate and water

ZnO + 2NaOH ===>> Na2ZnO2 + H2O


Means:

Zinc oxide + Sodium hydroxide==>Sodium zincate and water


ii.) When Aluminum oxide reacts with sodium hydroxide then it forms sodium aluminate.

Al2O3+ 2NaOH ===>> 2NaAlO2 + H2O


Means:

Aluminum oxide + Sodium hydroxide==> Sodium aluminate and water


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