First slide

13th group or boron group

Question

Boric acid when burnt with ethyl-alcohol gives a green edged flame due to the combustion of ____?

Moderate

A

Boric anhydride
B

Meta-boric acid
C

Tri-ethyl borate
D

Ortho boric acid

Solution

Following is the reaction
$B {(O H)}_{3} + 3 C_{2} H_{5} O H \to_{H e a t}^{H_{2} S O_{4}} B {(O C_{2} H_{5})}_{3} + 3 H_{2} O$
Tri-ethyl borate burns with a green edge flame.

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