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Question

In aqueous solution, the liquid that absorbs nitric oxide to a considerable extent is :

A
lead nitrate
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B
nitric acid
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C
ferrous sulphate
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D
sodium hydroxide
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Solution

The correct option is C ferrous sulphate
The absorption of nitric oxide is carried by the aqueous solutions of various salts. The aqueous solutions of ferrous salts like FeSO4 absorb considerable amounts of nitric oxide and the solubility of the gas increases with the concentration of the solution. Unstable chemical compounds are formed of the type FeSO4.NO but the ready dissociation of such compounds under the influence of heat indicates only a feeble combination. The absorption of nitric oxide by bivalent salt solutions of nickel, cobalt, and manganese is of a similar nature. Hence, the most appropriate answer among the options is C

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