Practical Chemistry

Which one of the following cations gives a chocolate brown precipitate upon addition of aqueous solution of $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ ？

Kjeldahl's method cannot be used for the estimation of nitrogen in which compound?

The compound that does not give positive test for nitrogen in Lassaigne's test is

To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green, when the colourless gas is passed through...

Compound X is tested and the results are shown in the table.
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