34.(i) Ajay while preparing lunch for his parents kept curd in copper bowl and left it for three hours. When his parents ate curd, it tasted bad. What could be the possible reason for this?
(ii) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9. Which solution is (a) weakly acidic (b) Strongly acidic (c ) Neutral (d) Strongly alkaline.
Arrange the solutions in increasing order of number of hydrogen ions liberated in aqueous solution.
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The curd contains lactic acid when, the lactic acid present in the curd reacts with the copper it forms some salt, water and other components The salt, water and other components mix with this curd. Thus, making the curd taste bad.
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