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SSC CGL
hardQ. No. 14870

Ionisation isomers differ in which respect?

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Ionisation isomers are coordination compounds that have the same overall composition but produce different ions in solution. They arise when an ion inside the coordination sphere exchanges position with a counter-ion outside the sphere. The first compound releases sulphate ions in water, whereas the second releases bromide ions. Their coordination number can remain the same. Spatial arrangement describes geometrical or optical isomerism, while a ligand bonding through different donor atoms gives linkage isomerism. Therefore, Option C, ions produced in solution, is correct. Concept depth: Coordination compounds contain a coordination sphere, written inside square brackets, and counter-ions outside it. Ionisation isomerism occurs when a coordinated ionic ligand and an external counter-ion exchange positions while the overall composition remains the same.

ASpatial arrangement
BPoint of attachment of a ligand
CIons produced in solution
DCoordination number
Correct Answer: Ions produced in solutionYour Answer: C

Explanation

Correct answer: Option C — Ions produced in solution. Ionisation isomerism changes which ion is coordinated to the metal and which ion acts as the counter-ion. Spatial arrangement and ligand attachment describe other forms of coordination isomerism, while coordination number need not change. Option analysis: Different spatial arrangement describes geometrical or optical isomerism. Different donor-atom attachment of an ambidentate ligand describes linkage isomerism, such as nitro and nitrito forms. Coordination number need not change in ionisation isomerism. The defining observation is the production of different ions in solution, as in [Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄]Br.

Important Notes

  • Ionisation isomers release different ions in solution.
  • An inner-sphere ionic ligand exchanges with an outer counter-ion.
  • Coordination number does not necessarily change.

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FAQ

SSC CGL Chemistry FAQs

Common questions and clear answers for this topic.

What differs in ionisation isomers?

They produce different ions in solution.

Why do ionisation isomers form?

An ion inside the coordination sphere exchanges with a counter-ion outside it.

Does ionisation isomerism change the coordination number?

Not necessarily; the key change is which ion is inside or outside the coordination sphere.

How can ionisation isomers be distinguished experimentally?

By testing the different ions they release in solution.

How many chemistry questions typically appear in the SSC CGL exam?

Chemistry usually contributes a handful of questions within the General Awareness section, generally covering basic concepts rather than calculation-heavy problems.

Which chemistry topics are most important for SSC CGL preparation?

Atomic structure, periodic table trends, acids-bases-salts, metals and non-metals, and carbon compounds are the areas that appear most consistently across past papers.

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