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Which of the following statements is incorrect?

1. Pure sodium metal dissolves in liquid ammonia to give blue solution.
2. NaOH reacts with glass to give sodium silicate
3. Aluminium reacts with excess NaOH to give Al(OH)3
4. NaHCO3 on heating gives Na2CO3

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

Solution

The incorrect statement is C. Aluminium reacts with excess NaOH to form sodium aluminate (Na[Al(OH)4]), not Al(OH)3. Al(OH)3 is formed only in limited NaOH.

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