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Which of the following is a spontaneous reaction?

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Which of the following is a spontaneous reaction?

(a) Production of ammonia

(b) Corrosion of metals

(c) Photosynthesis reaction

(d) Generation of oxygen from water

I got this question in an online quiz.

I'm obligated to ask this question of Modern Theory Principles in chapter Modern Theory Principles of Corrosion Engineering

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Correct option is (b) Corrosion of metals

Explanation: Spontaneous reaction is a reaction in which the reactants convert into products without any supply of external energy. Oxidation of metal atoms into metal ions due to the instability of metallic atoms is known as the corrosion of metals.

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