A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue litmus solution.

Monjur Alahi

A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue litmus solution. If the colour of the solution is changed to red, what inference can be drawn about the nature of the fruit and why ?


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Salim Ahmed Kawsar

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The fruit may be a citrus fruit or its juice may contain an acid, that is why the traces of acid remained in the knife that turned the blue litmus red

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