Gce Model Questions Vol1 2025 Chemistry Question 2

Practice essay / theory question 2 from the 2025 Gce Model Questions Vol1 Chemistry examination. This question covers periodic table, transition metals, coordination chemistry, electron configuration, molar mass, magnetism .

Gce Model Questions Vol1 2025 Chemistry Essay / Theory
Topics: periodic table transition metals coordination chemistry electron configuration molar mass magnetism
Question 2 GCE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

The diagram shows a coordination complex. The central atom is labelled "M" and is surrounded tetrahedrally by four identical ligands each labelled "L". Each ligand is an ammonia molecule (NH₃). A sulphate ion (SO₄²⁻) and a water molecule (H₂O) are shown as counter‑ions attached to the complex. The following information is given: - The metal atom M belongs to period 4 of the periodic table. - In this complex the metal exhibits a +2 oxidation state. - The atomic radius of M is 128 pm. - Standard atomic masses (g mol⁻¹) are: Cu = 63.55, N = 14.01, H = 1.008, O = 16.00, S = 32.07. Using the diagram and the data above, answer the questions that follow.

Question Parts

( a )
Identify the element represented by M. Justify your choice using the period, oxidation state and atomic radius information.
( b )
Write the electron configuration of the metal atom in its ground state and in the +2 oxidation state present in the complex.
( c )
Calculate the molar mass of the complex [Cu(NH₃)₄]SO₄·H₂O. Show all steps.
( d )
Using crystal‑field theory for a tetrahedral complex, determine the number of unpaired electrons on the metal centre and state whether the complex is paramagnetic or diamagnetic. Explain your reasoning.
( e )
Discuss how the position of copper in the periodic table influences (i) its common oxidation states and (ii) the typical colour observed for its coordination complexes.

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About This Question

This is Gce Model Questions Vol1 2025 Chemistry Question 2. It is one of the essay questions from the 2025 Gce Model Questions Vol1 Chemistry examination.

The question covers periodic table, transition metals, coordination chemistry, electron configuration, molar mass, magnetism .

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