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What is homogeneous nucleation?

(a) Spontaneously generated nuclei

(b) Randomly generated nuclei

(c) Orderly generated nuclei

(d) Randomly and spontaneously generated nuclei

I had been asked this question in an online quiz.

This key question is from Crystallization topic in section Crystallization of Food Processing Unit Operations

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Right option is (d) Randomly and spontaneously generated nuclei

For explanation I would say: Homogeneous nucleation is the process by which nuclei that are randomly and spontaneously generated grow irreversibly to form a new phase.

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