Q. Which of the following statements is incorrect?
A) Aluminium reacts with excess NaOH to give Al(OH)₃
B) NaHCO₃ on heating gives Na₂CO₃
C) Pure sodium metal dissolves in liquid ammonia to give blue solution
D) NaOH reacts with glass to give sodium silicate
Explanation
[Solution from source] Aluminium dissolves in excess NaOH to give sodium aluminate, Na[Al(OH)₄], and H₂; any Al(OH)₃ formed redissolves, so that statement is incorrect. NaHCO₃ does decompose to Na₂CO₃ on heating, sodium gives a blue solution in liquid ammonia (ammoniated electrons), and NaOH attacks glass to form sodium silicate. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.