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  • Which of the following statements is incorrect?Option: 1 Aluminium reacts with excess NaOH to give <img alt="Al(OH)_{3}" src="https://entranceco

Which of the following statements is incorrect?

Option: 1

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


Option: 2

NaHCO_{3} on heating gives Na_{2}CO_{3}


Option: 3

Pure sodium metal dissolves in liquid ammonia to give blue solution


Option: 4

NaOH reacts with glass to give sodium silicate.


Answers (1)

best_answer

Aluminum reacts with an excess of NaOH
Al+3NaOH\rightarrow Al(OH)_{3}+3Na^+\\Al(OH)_{3}+NaOH\rightarrow 2Na^+[Al(OH)_{4}]^-\rightarrow NaAlO_{2}+2H_{2}O

On heating NaHCO_{3} we get Na_2CO_{3}

2NaHCO_{3}\rightarrow Na_{2}CO_{3}+CO_2+H_{2}O

When sodium is added to ammonia, a dark blue color can be seen which is due to the presence of ammoniated electrons. In increasing concentrations of sodium, the color is copperish green. 

Sodium hydroxide can react with silicates present in the glass, as silicates are acidic in nature. 
hence, the correct answer is option 1. 

 

Posted by

Kuldeep Maurya

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