Many metals, like, chromium, molybdenum, cobalt and nickel become inert (chemically unreactive) on adding concentrated:

barium sulphate

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nitric acid

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caustic soda

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a solution of bromine in water

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Solution

The correct option is B nitric acid
Many metals like chromium, molybdenum, Cobalt, Nickel become inert in conc. $H N O_{3}$ because of the formation of the passive film of oxide on the surface of the metal. The metal forms its own oxide due to which these metal does not dissolve in concentrated $H N O_{3}$ due to these oxide layers.

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Metals like iron, aluminium, cobalt and nickel become passive when treated with pure concentrated nitric acid.

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