Question

How will you test the presence of carbon in a given substance

Answer 1

with the help of lime water

Answer 2

if an organic compound which is to be tested for the presence of carbon is heated in presence of dry cupric oxide (CuO) and it gives carbon dioxide, it contains carbon. Carbon dioxide does not support combustion, so a burning candle when brought close to it is extinguished. Also it turns lime water milky.