1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

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?

A
$$ 30.24 \quad \& \quad \mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_4 \mathrm{NOS}\right] $$
B
$$ 20.6 \quad \& \quad \mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right] $$
C
$$ 40.27 \quad \& \quad \mathrm{Na}\left[\mathrm{Fe}(\mathrm{CN})_3 \mathrm{NOS}\right] $$
D
$$ 9.156 \quad \& \quad \mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right] $$
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

Presence of halogen in organic compounds can be detected using

A
Beilstien's test
B
Kjeldahl test
C
Duma's test
D
Liebig's test
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