Q. Milk tastes sour when kept in the open for some time due to the formation of :

A
Carbonic acid
B
Citric acid
C
Lactic acid
D
Malic acid
Solution:

Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses lactose for energy and creates lactic acid as a by-product. It is the lactic acid which makes milk taste sour

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