In the biuret test, the presence of proteins is indicated by colour.

red

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blue black

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violet

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Solution

The correct option is D violet
In the biuret test, the food to be tested is treated with biuret solution. Biuret solution consists of copper sulphate and sodium hydroxide. The food to be tested changes its colour to violet or purple indicating the presence of proteins.

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In the biuret test, the presence of proteins is indicated by colour.

The correct option is D violetIn the biuret test, the food to be tested is treated with biuret solution. Biuret solution consists of copper sulphate and sodium hydroxide. The food to be tested changes its colour to violet or purple indicating the presence of proteins.

The correct option is D violet
In the biuret test, the food to be tested is treated with biuret solution. Biuret solution consists of copper sulphate and sodium hydroxide. The food to be tested changes its colour to violet or purple indicating the presence of proteins.