Questions
The colour observed by burning the vapours obtained by heating a mixture of borax or boric acid with C2H5OH and H2SO4 is :
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a
green
b
deep blue
c
yellow
d
red
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Correct option is A
Na2B4O7+H2SO4+5H2O→ Na2SO4+4H3BO3H3BO3+3C2H5OH→H2SO4C2H53BO3Burns withgreen flame+3H2OSimilar Questions
Which of the following oxides is acidic in nature ?
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