274399
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
1 ferroferricyanide
2 ferriferrocyanide
3 potassium ferricyanide
4 potassium ferrocyanide
Explanation:
(B) : The blue colour is due to the formation of ferriferrocyanide, $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$. $6 \mathrm{NaCN}+ \mathrm{FeSO}_{4} \longrightarrow \mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Na}_{2} \mathrm{SO}_{4}$ $\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Fe}^{3+} \longrightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ Ferric ferrocyanide
COMEDK 2012
COORDINATION COMPOUNDS
274400
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
(B) : When $\mathrm{NH}_{4} \mathrm{OH}$ is added to the solution containing $\mathrm{Cu}^{2+}$ ions, deep blue solution is obtained. $\mathrm{Cu}^{2+}+4 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2}+\mathrm{H}_{2} \mathrm{O}$ Hydrated cupric compounds absorb radiations corresponding to red light and transmitted colour is greenish blue (which is complementary to red color). Thus, cupric compounds give greenish blue colour.
AIIMS-2007
COORDINATION COMPOUNDS
274406
During estimation of nickel, we prepare nickel dimethylglyoxime, a scarlet red solid. This compound is - .
1 ionic
2 covalent
3 metallic
4 non-ionic complex
Explanation:
(D) : Bis -(dimethylglyoximato) nickel (II) chelated complex (red PPt).
NEET Test Series from KOTA - 10 Papers In MS WORD
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COORDINATION COMPOUNDS
274399
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
1 ferroferricyanide
2 ferriferrocyanide
3 potassium ferricyanide
4 potassium ferrocyanide
Explanation:
(B) : The blue colour is due to the formation of ferriferrocyanide, $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$. $6 \mathrm{NaCN}+ \mathrm{FeSO}_{4} \longrightarrow \mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Na}_{2} \mathrm{SO}_{4}$ $\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Fe}^{3+} \longrightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ Ferric ferrocyanide
COMEDK 2012
COORDINATION COMPOUNDS
274400
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
(B) : When $\mathrm{NH}_{4} \mathrm{OH}$ is added to the solution containing $\mathrm{Cu}^{2+}$ ions, deep blue solution is obtained. $\mathrm{Cu}^{2+}+4 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2}+\mathrm{H}_{2} \mathrm{O}$ Hydrated cupric compounds absorb radiations corresponding to red light and transmitted colour is greenish blue (which is complementary to red color). Thus, cupric compounds give greenish blue colour.
AIIMS-2007
COORDINATION COMPOUNDS
274406
During estimation of nickel, we prepare nickel dimethylglyoxime, a scarlet red solid. This compound is - .
1 ionic
2 covalent
3 metallic
4 non-ionic complex
Explanation:
(D) : Bis -(dimethylglyoximato) nickel (II) chelated complex (red PPt).
274399
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
1 ferroferricyanide
2 ferriferrocyanide
3 potassium ferricyanide
4 potassium ferrocyanide
Explanation:
(B) : The blue colour is due to the formation of ferriferrocyanide, $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$. $6 \mathrm{NaCN}+ \mathrm{FeSO}_{4} \longrightarrow \mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Na}_{2} \mathrm{SO}_{4}$ $\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Fe}^{3+} \longrightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ Ferric ferrocyanide
COMEDK 2012
COORDINATION COMPOUNDS
274400
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
(B) : When $\mathrm{NH}_{4} \mathrm{OH}$ is added to the solution containing $\mathrm{Cu}^{2+}$ ions, deep blue solution is obtained. $\mathrm{Cu}^{2+}+4 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2}+\mathrm{H}_{2} \mathrm{O}$ Hydrated cupric compounds absorb radiations corresponding to red light and transmitted colour is greenish blue (which is complementary to red color). Thus, cupric compounds give greenish blue colour.
AIIMS-2007
COORDINATION COMPOUNDS
274406
During estimation of nickel, we prepare nickel dimethylglyoxime, a scarlet red solid. This compound is - .
1 ionic
2 covalent
3 metallic
4 non-ionic complex
Explanation:
(D) : Bis -(dimethylglyoximato) nickel (II) chelated complex (red PPt).
274399
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
1 ferroferricyanide
2 ferriferrocyanide
3 potassium ferricyanide
4 potassium ferrocyanide
Explanation:
(B) : The blue colour is due to the formation of ferriferrocyanide, $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$. $6 \mathrm{NaCN}+ \mathrm{FeSO}_{4} \longrightarrow \mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Na}_{2} \mathrm{SO}_{4}$ $\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+\mathrm{Fe}^{3+} \longrightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ Ferric ferrocyanide
COMEDK 2012
COORDINATION COMPOUNDS
274400
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
(B) : When $\mathrm{NH}_{4} \mathrm{OH}$ is added to the solution containing $\mathrm{Cu}^{2+}$ ions, deep blue solution is obtained. $\mathrm{Cu}^{2+}+4 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2}+\mathrm{H}_{2} \mathrm{O}$ Hydrated cupric compounds absorb radiations corresponding to red light and transmitted colour is greenish blue (which is complementary to red color). Thus, cupric compounds give greenish blue colour.
AIIMS-2007
COORDINATION COMPOUNDS
274406
During estimation of nickel, we prepare nickel dimethylglyoxime, a scarlet red solid. This compound is - .
1 ionic
2 covalent
3 metallic
4 non-ionic complex
Explanation:
(D) : Bis -(dimethylglyoximato) nickel (II) chelated complex (red PPt).
