WAEC Chemistry 2025 Objective — Question 23
Question 23 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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A covalent hydride which does not exist as a gas at room temperature is
- A. H2OCorrect
- B. BH3
- C. HCl
- D. H2S
Explanation
Water is a covalent compound composed of hydrogen and oxygen. Despite being a small molecule, H2O is a liquid at room temperature due to the presence of strong hydrogen bonds between water molecules, which require significant energy to break, unlike BH3, HCl and H2S which are gases at room temperature.
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