SATHEE: Coordination Compounds 2 Question 50

Coordination Compounds 2 Question 50

####52. Addition of excess aqueous ammonia to a pink coloured aqueous solution of $M C l_{2} \cdot 6 H_{2} O (X)$ and $N H_{4} C l$ gives an octahedral complex $Y$ in the presence of air. In aqueous solution, complex $Y$ behaves as $1 : 3$ electrolyte. The reaction of $X$ with excess $H C l$ at room temperature results in the formation of a blue colured complex $Z$ . The calculated spin only magnetic moment of $X$ and $Z$ is 3.87 B.M., whersas it is zero for complex $Y$ .

Among the following options, which statement(s) is (are) correct?

(2017 Adv.)

(a) The hybridisation of the central metal ion in $Y$ is $d^{2} s p^{3}$

(b) Addition of silver nitrate to $Y$ given only two equivalents of silver chloride

(d) $Z$ is a tetrahedral complex

Assertion and Reason

Read the following questions and answer as per the direction given below:

(a) Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.

(b) Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.

(d) Statement I is false; Statement II is true.

Show Answer

Answer:

Correct Answer: 52. (c)

Solution:

${\underset{Pink (X)}{[C o {(H_{2} O)}_{6}}]}_{C l_{2}} \to_{O_{2} (Air)}^{Excess N H_{4} O H / N H_{4} C l} \underset{Y}{C o {(N H_{3})}_{6}}] C l_{3}$

$\underset{X}{{[C o {(H_{2} O)}_{6}]}^{2 +}} + \underset{(Excess)}{4 C l^{-}} ⟶ \underset{blue Z}{{[C o C l_{4}]}^{2 -}}$

(a) Since $N H_{3}$ is moderately strong ligand, hybridisation of cobalt in $Y$ is $d^{2} s p^{3}$ .

(b) Cobalt is $s p^{3}$ -hybridised in ${[C o C l_{4}]}^{2 -}$ .

(d) ${{[C o C l_{4}]}^{2 -} + 6 H_{2} O ⇌ \underset{Blue}{[C o {(H_{2} O)}_{6}}]}^{2 +} + 4 C l^{-}; Δ H < 0$

Coordination Compounds 2 Question 50

Assertion and Reason

Answer:

Engineering Preparation

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Coordination Compounds 2 Question 50

Assertion and Reason

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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