Match the compounds given in Column I with the oxidation state of cobalt present in it given in column II and assign the correct code-WhineB- - Co NH -3-4 Cl -2- SO -4- 2 - - 0 NllhlineC- -Na -4-Co S -2 O -3-3- - 3- -2 lllhlineA- - Co -2 CO -8- - 4 - -3 11 hlineendarray Code -eginmatrix - A - B - C - D 1a- 1 - 2 - 4 - 3 1b- 4 - 3 - 2 - 111c- 3 - 1 - 4 - 211d - 4 - 1 - 3 - 2endmatrix

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Potassium Dichromate

Match the com...

Question

Match the compounds given in Column I with the oxidation state of cobalt present in it (given in column II) and assign the correct code.

$\begin{matrix} Column~I & Column~II (C o m p o u n d) & (O x i d a t i o n s t a t e o f C o) A . [C o (N C S) (N H_{3})_{5}] (S O_{3}) & 1. + 4 B . [C o (N H_{3})_{4} C l_{2}] S O_{4} & 2. 0 C . N a_{4} [C o (S_{2} O_{3})_{3}] & 3. + 2 A . [C o_{2} (C O)_{8}] & 4. + 3 \end{matrix}$

Code

$\begin{matrix} A & B & C & D (a) & 1 & 2 & 4 & 3 (b) & 4 & 3 & 2 & 1 (c) & 3 & 1 & 4 & 2 (d) & 4 & 1 & 3 & 2 \end{matrix}$

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Solution

$A . \to (4) B . \to (1) C . \to (3) D . \to (2)$
Oxidation state of CMI (central metal ion) can be calculated by considering the oxidation state of whole molecule is equal to charge present on coordination sphere.

A. $[C o (N C S) (N H_{3})_{5}] (S O_{3})$
Let oxidation state of Co is x.
$x - 1 + 5 \times 0 = + 2 x = + 2 + 1 = + 3$

B. $[C o (N H_{3})_{4} C l_{2}] S O_{4}$
Let oxidation state of Co = x.
$\Rightarrow x + 4 \times 0 + 2 \times (- 1) = + 2 \Rightarrow x - 2 = + 2 x = 4$

C. $N a_{4} [C o (S_{2} O_{3})_{3}]$
Let oxidation state of Co = x.
$x + 3 \times (- 2) = - 4 x - 6 = - 4 x = - 4 + 6 = + 2$

D. $[C o_{2} (C O)_{8}]$
Let oxidation state of Co = x.
$x - 8 \times 0 = 0 x = 0$

Hence, correct choice is (d).

Suggest Corrections

Similar questions

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Match the complex ions given in Column I with the hybridisation and number of unpaired electrons given in Column II and assign the correct code.

$\begin{matrix} Column~I & Column~II (C o m p l e x i o n) & (H y b r i d i s a t i o n, n u m b e r o f u n p a i r e d e l e c t r o n s) A . [C r (H_{2} O)_{6}]^{3 +} & 1. d s p^{2}, 1 B . [C o (C N)_{4}]^{2 -} & 2. s p^{3} d^{2}, 5 C . [N i (N H_{3})_{6}]^{2 +} & 1. d^{2} s p^{3}, 3 D . [M n F_{6}]^{4 -} & 2. s p^{3} d^{2}, 2 \end{matrix}$

Codes

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Match the items of Column I with the items of Column II and assign the correct code.
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Codes
A B C D A B C D
(a) 3 4 2 1 (b) 5 4 3 2
(c) 2 3 4 5 (d) 1 2 3 4

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