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Take things which are sour in taste and used as food. Eg. Curd, lemon juice. If you check these substances with blue and red litmus what happens?

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1. When a drop of curd is put on blue litmus paper the colour changed to red indicating the acidic nature of curd. 

2. When a drop of lemon juice is put on the blue litmus paper, the colour of the paper changed to red indicating the acidic nature of lemon juice.

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