Waec Model Questions Vol1 2019 Chemistry Question 3

Practice essay / theory question 3 from the 2019 Waec Model Questions Vol1 Chemistry examination. This question covers Chemical Bonding .

Waec Model Questions Vol1 2019 Chemistry Essay / Theory
Topic: Chemical Bonding
Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • essay

A newly discovered compound X has the empirical formula MX₂ where M is a metal and X is a non‑metal. The compound is a white solid, has a high melting point, conducts electricity when molten but not in the solid state, and reacts with dilute acid to release hydrogen gas.

Question Parts

( a )
Identify the type of chemical bond(s) present in compound X and justify your answer using the properties given.
( b )
Assuming M belongs to Group 2 of the periodic table and X belongs to Group 16, write a plausible ionic formula for X and show how the charges balance.
( c )
Draw the Lewis‑dot representation for the ion pair that makes up the solid and indicate the type of lattice arrangement that is most likely to be adopted.
( d )
Explain why compound X conducts electricity when molten but not as a solid, linking your explanation to its bonding nature and lattice structure.

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About This Question

This is Waec Model Questions Vol1 2019 Chemistry Question 3. It is one of the essay questions from the 2019 Waec Model Questions Vol1 Chemistry examination.

The question covers Chemical Bonding .

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