Carbon monoxide can be estimated by reaction with

Options

A. ammoniacal solution of cuprous chloride
B. (2) ammoniacal solution of silver nitrate
C. `PdCl_(2)`
D. `I_(2)O_(5)`

Answer

D

Explanation

`5CO(g) + I_(2)O_(5) rarr I_(2)(s) + 5CO_(2)(g)`
The iodine which is produced quantitatively is titrated with standard sodium thiosulphate solution.
`CO` is readily absorbed by an ammoniacal solution of `CuCl` to give `CuCl . CO . 2H_(2)O`. It reduces an ammoniacal solution of `AgNO_(3)` to silver (black). In the absence of other gaseous reducing agents, this serves as a test for the gas.
It also reduces `PdCl_(2)` to `Pd`
`PdCl_(2) + CO + H_(2)O rarr Pd + CO_(2) + 2HCl`