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Out of the following gases, which gas is...

Out of the following gases, which gas is used by the plants - Nitrogen, oxygen, carbon dioxide?

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Molisch.s Test : This is a general test for carbohydrates, One or two drops of alcoholic solution of a-naphtholis added to 2 ml glucose solution, 1 ml of conc. `H_(2)SO_(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 carbohydrate or sugar.
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