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If it will kept in summer it will spoil and can't be taste and ouder will be not good at all.
what type of reaction takes place in this case?????
sorry i do't know the reaction
it get spread

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The idly get sour and spoiled and cannot be eaten, because the Micro-organisms act faster as the temperature and season is suitable for their growth on the dough and hence it becomes unfit for eating.
It is a chemical reaction which takes place and hence it is not reversible.