In the estimation of element \(\mathrm{X}\) in an organic compound, \(0.8 \mathrm{~g}\) of the compound containing \(\mathrm{X}\) was heated with fuming \(\mathrm{HNO}_3\) and the cooled product was treated with barium chloride. The mass of barium sulphate precipitated was \(1.2 \mathrm{~g}\). What is the percentage of element \(\mathrm{X}\) and what is the formula of the violet-coloured compound formed when Lassaigne's extract of the organic compound is treated with sodium nitroprusside?

1. A \(40.27 \quad \& \quad \mathrm{Na}\left[\mathrm{Fe}(\mathrm{CN})_3 \mathrm{NOS}\right]\)
2. B \(20.6 \quad \& \quad \mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]\)
3. C \(9.156 \quad \& \quad \mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]\)
4. D \(30.24 \quad \& \quad \mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_4 \mathrm{NOS}\right]\)