Juice of tamarind turns blue litmus red: the acid

The same question, asked 3 times: 2024*, 2025*, 2026. Every wording below, oldest first.

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Question 1
2024
2 $Juice of tamarind turns blue litmus to red. It is because of the presence of an acid called :$
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Question 2
2025
6 $Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called$
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Question 3
2026
17 $Tamarind is a natural source of which acid ?$
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