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Calcination

Which of the ...

Question

Which of the following statements is incorrect
1) NaHCO3 on heating gives NA2CO3
2) pure sodium metal dissolves in liquid ammonia to give blue solution
3) NaOH reacts with glass to give sodium silicate
4) Aluminium reacts with excess NaOH to give Al(OH)3

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Solution

option 4
Aluminium reacts with excess NaOH to give Al(OH)3
is incorrect
because Aluminium reacts with excess NaOH to form NaAlO2, and this species contain the ions [Al(OH)₄]⁻

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