CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Introduction to CFT

When cobaltII...

Question

When cobalt $(I I)$ chloride is dissolved in water, a pink solution A is formed. When ammonia is passed through the solution, orange red solution is obtained. Then the sum of the coordination number and the oxidation state of central metal in the yellow coloured solution is :

Open in App

Solution

$C o C l_{2} H_{2} O - - \to [C o (H_{2} O)_{6}]^{2 +} Pink N H_{3} (Excess) - ------- \to [C o (N H_{3})_{6}]^{2 +}$
Here $[C o (N H_{3})_{6}]^{2 +}$ is unstable and oxidised to $[C o (N H_{3})_{6}]^{3 +}$ , which is yellow in colour.
$[C o (N H_{3})_{6}]^{2 +} \to [C o (N H_{3})_{6}]^{3 +} Yellow$
$∴$ Coordination number $= 6$
Oxidation state $= + 3$
$∴$ Sum is $6 + 3 = 9$

Suggest Corrections

thumbs-up

0

Similar questions

Q. When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution due to:

Q. A metal chloride

(X)

shows the following reactions:
(i) When

H_{2} S

is passed in an acidified aqueous solution of

(X)

a black ppt. is obtained.
(ii) the precipitate obtained in step (i) is not soluble in yellow ammonium sulphide.
(iii) when a solution of stannous chloride is added to an aqueous solution of

(X)

, a white precipitate is obtained which turns grey on addition of more of stannous chloride.
(iv) when an aqueous solution of

K l

is added to an aqueous solution of

(X)

, a red precipitate is obtained which dissolves on addition of excess of

K l

(X)

C O_{2}

into aqueous yellow coloured

C r O_{4}^{2 -}

solution, an orange coloured

C r_{2} O_{7}^{2 -}

solution is obtained. Is this oxidation or reduction? The reaction is given below:

C r O_{4}^{2 -} (a q) C O_{2} - - \to C r_{2} O_{7}^{2 -}

Q. A black compound ‘A’ in its solid state is fused with

K O H

K C l O_{3}

. The aqueous extract of the fused mass is a green coloured solution ‘B’. On passing

C O_{2}

gas through it, pink colour of ‘C’ is noticed along with some black insoluble mass of ‘A’. The pink coloured solution is decolourised by

F e^{2 +}

in acidic medium. The oxidation state of the central metal in ‘C’ is?

Q. The colour of the precipitate formed when acetylene is passed through ammonical cuprous chloride solution is :

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Introduction to Crystal Field Theory

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Introduction to CFT

Standard XIII Chemistry

Join BYJU'S Learning Program

CrossIcon