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Co-ordination Compounds NEET Questions — Free MCQ Practice

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Assertion : tris (ethane-1, 2-diamine) nickel(II) chloride is homoleptic outer orbital complex

Reason : The geometry of Ni in tris (ethane-1, 2-diamine) nickel(II) chloride is trigonal bipyramidal.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(C) $[Ni {(en)}_{3}] {Cl}_{2}$ is paramagnetic with two unpaired electrons and has octahedral geometry with ${sp}^{3} d^{2}$

hybridisation and as nd orbital participate in hybridisation it is outer orbital complex. As all ligands

are as same type, the complex is termed as homoleptic.

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Assertion : Bis(dimethylglyoximato)nickel(II) can show geometrical isomerism.

Reason : Tetrahedral complexes with chiral structure exhibit optical isomerism.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Assertion : The magnitude of charge density for a given ligand increases as the charge on the metal

ion increases.

Reason : ${NH}_{3}$ is a weak field ligand towards ${Co}^{2 +}$ but acts as a strong field ligand towards ${Co}^{3 +} .$

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(B) As metal ion charge increases the ligands are drawn closer to the metal ion because of its increased

charge density. As the ligands move closer, they cause greater splitting of the d-orbital, there by

producing a large $∆ t_{2 g}$ value.

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Vitamin- B₁₂ contains

A.

Zn (II)

B.

Ca (II)

C.

Fe (II)

D.

Co (II)

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Explanation

The molecular formula of vitamin-B12 is C₆₃H₈₄ N₁₄O₁₄ PCO and the chemical name is cyanocobalamine. So, cobalt is present in vitamin-B₁₂.

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In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called

A.

selection of superion recombinations

B.

cross-hybridisation among the selected parents

C.

evaluation and selection of parents

D.

germplasm collection

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Explanation

(d) It is called germplasm collection or the collection of variability. Selection of superior recombinants means selection of the best plant from the whole lot by visual examination and collecting their seeds for growing in field. Cross hybridisation is the method of combining the characters of different plants together. The selection and evolution are the main steps of hybridisation.

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A collection of plants and seeds having diverse alleles of all the genes of a crop is called

A.

germplasm

B.

gene library

C.

genome

D.

herbarium

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Explanation

(a) a germplasm is a collection of genetic resources for an organisms. For plants, the germplasm may be stored as a seed collection of all the genes of an organism.

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Which statement about Alfred Werner's contribution to coordination chemistry is NOT true?

A. He proposed the concept of primary and secondary valency for metal ions. B. His theory explained all magnetic and optical properties of coordination compounds. C. He was the first Swiss chemist to win the Nobel Prize for his work on coordination theory. D. He formulated his revolutionary ideas about chemical linkages in a short span of three years.

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Explanation

According to the NCERT text, 'Werner was the first to describe the bonding features in coordination compounds. But his theory could not answer basic questions like: (iii) Why coordination compounds have characteristic magnetic and optical properties?' Therefore, the statement that his theory explained all magnetic and optical properties is incorrect.

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In Werner's theory, what is the nature of primary valences?

A. Non-ionisable and satisfied by neutral molecules. B. Ionisable and satisfied by positive ions. C. Ionisable and satisfied by negative ions. D. Non-ionisable and equal to the coordination number.

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Explanation

The NCERT states, 'The primary valences are normally ionisable and are satisfied by negative ions.'

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According to Werner's theory, what does the secondary valence of a metal ion represent?

A. The oxidation state of the metal. B. The number of counter ions outside the coordination sphere. C. The number of groups directly bound to the metal ion, which is non-ionisable. D. The charge on the coordination entity.

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Explanation

The NCERT text states, 'Werner proposed the term secondary valence for the number of groups bound directly to the metal ion; in each of these examples the secondary valences are six.' It also mentions, 'The secondary valences are non ionisable. These are satisfied by neutral molecules or negative ions. The secondary valence is equal to the coordination number and is fixed for a metal.'

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Consider a series of cobalt(III) chloride compounds with ammonia. If 1 mol of $CoCl_3\cdot 5NH_3$ gives 2 mol of AgCl upon adding excess silver nitrate solution, what does this indicate about the compound's structure based on Werner's theory?

A. All five ammonia molecules are outside the coordination sphere. B. Three chloride ions are directly bonded to the cobalt. C. Two chloride ions are in the primary valence sphere (ionisable), and one is in the secondary valence sphere (non-ionisable). D. Two chloride ions are outside the coordination sphere (ionisable), and one is inside (non-ionisable).

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Explanation

The NCERT text provides this specific example: '1 mol $CoCl_3\cdot 5NH_3$ (Purple) gave 2 mol AgCl'. This means 2 moles of chloride ions are ionisable, indicating they are in the primary valence sphere and not directly bonded to the metal. The remaining one chloride ion must be in the secondary valence sphere, directly bonded and non-ionisable.

Co-ordination Compounds MCQs for NEET — Chemistry Questions with Answers

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