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Q.

Change in the colour of black tea on adding lemon juice is an example of ____ changes.


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Detailed Solution

●        The acidity of tea is changed when lemon juice is added.
●        Tea contains 72% polyphenol pigment, and when acidic lemon juice is added, hydrogen ions block the ionisation of polyphenols, causing the tea to become lighter in colour.
●        As a result, the colour of black tea changes when lemon juice is added, which is an example of chemical change.
 
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