QBManager

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, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ .
$6 NaCN + {FeSO}_{4} ⟶ {Na}_{4} [Fe (CN)_{6}] + {Na}_{2} {SO}_{4}$
${Na}_{4} [Fe (CN)_{6}] + {Fe}^{3 +} ⟶ {Fe}_{4} {[Fe (CN)_{6}]}_{3}$
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?

1

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

2

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

3

{Fe}_{4} {[Fe (CN)_{6}]}_{2}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{3}

Karnataka NEET 2013

COORDINATION COMPOUNDS

274405 Wavelength of red light is absorbed by the complex

1

{[Cu (CN)_{4}]}^{2 -}

2

{[Cu {({NH}_{3})}_{4}]}^{2 +}

3

{CuSO}_{4}

4

Cu (CN)_{2}

Explanation:

(B) : When ${NH}_{4} OH$ is added to the solution containing ${Cu}^{2 +}$ ions, deep blue solution is obtained.
${Cu}^{2 +} + 4 {NH}_{4} OH ⟶ {[Cu {({NH}_{3})}_{4}]}^{2} + H_{2} O$
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

AIIMS-2007

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, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ .
$6 NaCN + {FeSO}_{4} ⟶ {Na}_{4} [Fe (CN)_{6}] + {Na}_{2} {SO}_{4}$
${Na}_{4} [Fe (CN)_{6}] + {Fe}^{3 +} ⟶ {Fe}_{4} {[Fe (CN)_{6}]}_{3}$
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?

1

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

2

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

3

{Fe}_{4} {[Fe (CN)_{6}]}_{2}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{3}

Karnataka NEET 2013

COORDINATION COMPOUNDS

274405 Wavelength of red light is absorbed by the complex

1

{[Cu (CN)_{4}]}^{2 -}

2

{[Cu {({NH}_{3})}_{4}]}^{2 +}

3

{CuSO}_{4}

4

Cu (CN)_{2}

Explanation:

(B) : When ${NH}_{4} OH$ is added to the solution containing ${Cu}^{2 +}$ ions, deep blue solution is obtained.
${Cu}^{2 +} + 4 {NH}_{4} OH ⟶ {[Cu {({NH}_{3})}_{4}]}^{2} + H_{2} O$
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

AIIMS-2007

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, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ .
$6 NaCN + {FeSO}_{4} ⟶ {Na}_{4} [Fe (CN)_{6}] + {Na}_{2} {SO}_{4}$
${Na}_{4} [Fe (CN)_{6}] + {Fe}^{3 +} ⟶ {Fe}_{4} {[Fe (CN)_{6}]}_{3}$
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?

1

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

2

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

3

{Fe}_{4} {[Fe (CN)_{6}]}_{2}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{3}

Karnataka NEET 2013

COORDINATION COMPOUNDS

274405 Wavelength of red light is absorbed by the complex

1

{[Cu (CN)_{4}]}^{2 -}

2

{[Cu {({NH}_{3})}_{4}]}^{2 +}

3

{CuSO}_{4}

4

Cu (CN)_{2}

Explanation:

(B) : When ${NH}_{4} OH$ is added to the solution containing ${Cu}^{2 +}$ ions, deep blue solution is obtained.
${Cu}^{2 +} + 4 {NH}_{4} OH ⟶ {[Cu {({NH}_{3})}_{4}]}^{2} + H_{2} O$
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

AIIMS-2007

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, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ .
$6 NaCN + {FeSO}_{4} ⟶ {Na}_{4} [Fe (CN)_{6}] + {Na}_{2} {SO}_{4}$
${Na}_{4} [Fe (CN)_{6}] + {Fe}^{3 +} ⟶ {Fe}_{4} {[Fe (CN)_{6}]}_{3}$
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?

1

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

2

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

3

{Fe}_{4} {[Fe (CN)_{6}]}_{2}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{3}

Karnataka NEET 2013

COORDINATION COMPOUNDS

274405 Wavelength of red light is absorbed by the complex

1

{[Cu (CN)_{4}]}^{2 -}

2

{[Cu {({NH}_{3})}_{4}]}^{2 +}

3

{CuSO}_{4}

4

Cu (CN)_{2}

Explanation:

(B) : When ${NH}_{4} OH$ is added to the solution containing ${Cu}^{2 +}$ ions, deep blue solution is obtained.
${Cu}^{2 +} + 4 {NH}_{4} OH ⟶ {[Cu {({NH}_{3})}_{4}]}^{2} + H_{2} O$
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

AIIMS-2007

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