Waec Model Questions Vol1 2018 Chemistry Question 3

Practice essay / theory question 3 from the 2018 Waec Model Questions Vol1 Chemistry examination. This question covers Chemical Bonding .

Waec Model Questions Vol1 2018 Chemistry Essay / Theory
Topic: Chemical Bonding
Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • essay

A metal M from the first transition series forms an ionic compound with chlorine. In this compound the metal exhibits a +2 oxidation state and the compound has a high melting point. The metal also forms a covalent oxide MO₂ in which the metal exhibits a +4 oxidation state.

Question Parts

( a )
Write the chemical formula of the ionic compound formed between the metal M and chlorine.
( b )
Explain qualitatively why the lattice energy of MCl₂ is relatively high. In your answer discuss the effect of ionic charge and ionic radius and compare with a hypothetical compound MX where the metal is in the +1 oxidation state.
( c )
The metal also forms a covalent oxide MO₂ in which the metal has a +4 oxidation state. Compare the physical properties (melting point and electrical conductivity) of the ionic compound MCl₂ and the covalent oxide MO₂ and explain the differences on the basis of the type of bonding present.

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About This Question

This is Waec Model Questions Vol1 2018 Chemistry Question 3. It is one of the essay questions from the 2018 Waec Model Questions Vol1 Chemistry examination.

The question covers Chemical Bonding .

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