Q.

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

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a

boric anhydride

b

metaboric acid

c

ethyl borate

d

orthoboric acid

answer is C.

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Detailed Solution

When ortho boric acid is burnt with ethyl alcohol in presence of Conc H2SO4 gives triethyl ortho borate.When the vapours of triethyl borate ignited burn with a green edged flame.The green edged flame is due to the combustion of ethyl borate.This test is used to detect the borates and boric acid in qualitative analysis.
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Boric acid when burnt with ethyl alcohol gives a green edged flame due to the combustion of