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In the studies of Joffe and Sperll, it was observed that ________ is efficient for solubilizing Ni but the presence of ______ had adverse effect on leaching.

(a) T. ferrooxidans; cobalt

(b) T.trioxidanes; molybdenum

(c) T. ferrooxidans; molybdenum

(d) T. trioxidanes; cobalt

The question was asked in an interview for internship.

My question is from Metal Recovery by Bioleaching Process in division Bioleaching and Biomining for Recovery of Resources of Environmental Biotechnology

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The correct answer is (c) T. ferrooxidans; molybdenum

Explanation: T. ferrooxidans is efficient for Ni recovery but the presence of Mo makes it difficult. To overcome this, a mixture of heterotrophic denitrifying bacteria is used to effectively leach both nickel and molybdenum.

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