Substances that taste sour contain:
AAcids
BBases
CSalts
DMetals
Answer & Solution
Correct answer: A. Acids
1. Curd, lemon juice and vinegar all taste sour.
2. Something in them is responsible for that taste.
3. They taste sour because they contain acids.
4. So the answer is acids.
_Source: NCERT Class 7 Science, Ch 4 'Acids, Bases and Salts'_
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