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Which of the following metal catalyst is not used during catalytic oxidation of ammonia?

(a) Platinum

(b) Copper

(c) Nickel

(d) NaCl

This question was addressed to me during an online exam.

My question comes from Wastewater Treatment Systems in portion Bacterial Metabolism in Wastewater Treatment Systems of Environmental Biotechnology

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The correct answer is (d) NaCl

For explanation: Platinum, Copper and Nickel is used as a metal catalyst during catalytic oxidation of ammonia, NaCl is a salt and hence, cannot be used as a metal catalyst.

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