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General Principles And Processes Of Isolation Of Elements

Question
CBSEENCH12011231
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Which of the following statements in incorrect?

  • pure sodium metal dissolves in liquid ammonia to give blue solution

  • NaOH reacts with glass to give sodium silicate

  • Aluminium reacts with excess NaOH to give Al(OH)3

  • NaHCO3 on heating gives Na2CO3

Solution

C.

Aluminium reacts with excess NaOH to give Al(OH)3

Aluminium being amphoteric reacts with aqueous alkalies with the evolution of H2 gas.
2 Al (s) + 2NaOH (aq) + 6H2O (l) --> 2Na+[Al(OH)4]- (aq) +3 H2 ↑

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