b Molisch's Test : This is a general test for carbohydrates. One or two drops of alcoholic solution of $\alpha$ -naphthol is added to $2\; ml$ glucose solution. $1 \mathrm{ml}$ of conc. $H_{2} S O_{4}$ solution is added carefully along the sides of the test-tube. The formation of a violet ring at the junction of two liquids confirms the presence of a carbohydrare or sugar.
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