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Niti brings home two packets. One is a pickle bottle and the other a tomato soup packet. After opening the packet, reading the expiry date and smelling them she realizes that they’re both spoiled. Which of these two would she anyway haven’t known (other than the expiry date) to be spoiled without opening?

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Niti brings home two packets. One is a pickle bottle and the other a tomato soup packet. After opening the packet, reading the expiry date and smelling them she realizes that they’re both spoiled. Which of these two would she anyway haven’t known (other than the expiry date) to be spoiled without opening?

(a) Tomato soup packet

(b) Pickle

(c) Both tomato soup packet and pickle

(d) Neither tomato soup packet nor pickle

I got this question in an internship interview.

My question is taken from Principles of Food Preservation by Canning-2 topic in portion Principles of Food Preservation by Canning and Drying and Principles of Food Concentrates of Food Engineering

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The correct answer is (a) Tomato soup packet

The best explanation: Tomato soup packet went through something known as flat sour spoilage. In this kind of spoilage, only an acid is produced. This cannot be physically noticed without opening the packet. The pickle on the other hand produces acid upon spoilage and hence its package swells up due to which it is easily evident that it’s spoiled.

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