(B) The transition metal salt,typically cobalt$(II)$ chloride,exists as $[Co(H_2O)_6]^{2+}$ (pink) in aqueous solution.When concentrated $HCl$ is adde

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

change in the coordination number of the metal ion from $6$ to $4$ and formation of new species in solution

(B) The transition metal salt,typically cobalt$(II)$ chloride,exists as $[Co(H_2O)_6]^{2+}$ (pink) in aqueous solution.When concentrated $HCl$ is added,chloride ions $(Cl^-)$ act as ligands and replace water molecules to form the complex $[CoCl_4]^{2-}$ (blue).This reaction involves a change in the coordination number of the metal ion from $6$ to $4$ and the formation of a new chloro-complex species in the solution.

Class 12 Chemistry Coordination Compounds Complexes and complex stability

Medium

The aqueous solution of a transition metal salt changes colour from pink to blue when concentrated hydrochloric acid is added to it. The change in colour is due to:

A
evolution of hydrogen that changes the oxidation state of the metal ion
B
change in the coordination number of the metal ion from $6$ to $4$ and formation of new species in solution
C
formation of a coordination complex of the metal ion with hydrochloric acid
D
protonation of the metal ion

Explore More

Browse All

Question Bank

All Subjects

Class 12 Questions

Class 12

Chemistry Questions

Chapter

Coordination Compounds

Subtopic

Complexes and complex stability

The stepwise stability constants of a complex are given below. What is its overall reaction stability constant $\beta_4$ ?
$M + L \rightleftharpoons ML ; K_1 = 1.0 \times 10^4$
$ML + L \rightleftharpoons ML_2 ; K_2 = 1.0 \times 10^3$
$ML_2 + L \rightleftharpoons ML_3 ; K_3 = 1.0 \times 10^3$
$ML_3 + L \rightleftharpoons ML_4 ; K_4 = 1.0 \times 10^2$
(Overall reaction : $M + 4L \rightleftharpoons ML_4$)

MediumAP EAMCET 2019

View Solution

Which of the following is the correct order in the spectrochemical series of ligands?

Difficult

View Solution

Assertion : The $[Ni(en)_3]Cl_2$ ($en =$ ethylenediamine) has lower stability than $[Ni(NH_3)_6]Cl_2$.
Reason : In $[Ni(en)_3]Cl_2$,the geometry of $Ni$ is trigonal bipyramidal.

MediumAIIMS 2004

View Solution

Which is the correct equation for the reaction of $AgCl$ with $NH_4OH$?

MediumTS EAMCET 2019

View Solution

On adding excess of ammonium hydroxide to a copper chloride solution:

Medium

View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial

For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free

For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo

The aqueous solution of a transition metal salt changes colour from pink to blue when concentrated hydrochloric acid is added to it. The change in colour is due to:

Similar Questions

Which of the following is the correct order in the spectrochemical series of ligands?

Assertion : The $[Ni(en)_3]Cl_2$ ($en =$ ethylenediamine) has lower stability than $[Ni(NH_3)_6]Cl_2$.Reason : In $[Ni(en)_3]Cl_2$,the geometry of $Ni$ is trigonal bipyramidal.

Which is the correct equation for the reaction of $AgCl$ with $NH_4OH$?

On adding excess of ammonium hydroxide to a copper chloride solution:

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion : The $[Ni(en)_3]Cl_2$ ($en =$ ethylenediamine) has lower stability than $[Ni(NH_3)_6]Cl_2$.
Reason : In $[Ni(en)_3]Cl_2$,the geometry of $Ni$ is trigonal bipyramidal.