Chemistry
Milk tastes sour when it is left in open for some time. This happens due to the formation of

Carbonic acid
Citric acid
Acetic acid
Lactic acid

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Chemistry
Antacid tablets consist of

Hydroxides of magnesium and aluminium
Hydroxides of sodium, magnesium and aluminium
Hydroxides of magnesium and sodium
Hydroxides of sodium and aluminium

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