Igcse Model Questions Vol1 2022 Chemistry Question 34

Practice objective / multiple choice question 34 from the 2022 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Hard Difficulty
Question 34 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

The standard enthalpies of formation (\(\Delta_fH^\circ\)) of the hydrogen halides are: \(\Delta_fH^\circ(\mathrm{HCl}) = -92.3\ \text{kJ mol}^{-1}\), \(\Delta_fH^\circ(\mathrm{HBr}) = -36.3\ \text{kJ mol}^{-1}\), \(\Delta_fH^\circ(\mathrm{HI}) = +26.5\ \text{kJ mol}^{-1}\). Using the bond dissociation energy of H-H as 436 kJ mol⁻¹, calculate the H-X bond dissociation energy for each HX and rank the three bonds from strongest to weakest.

Answer Options

Correct Answer A. H-Cl ≈ 310 kJ mol⁻¹, H-Br ≈ 254 kJ mol⁻¹, H-I ≈ 192 kJ mol⁻¹; ranking: H-Cl > H-Br > H-I
B. H-Cl ≈ 300 kJ mol⁻¹, H-Br ≈ 240 kJ mol⁻¹, H-I ≈ 180 kJ mol⁻¹; ranking: H-Cl > H-I > H-Br
C. H-Cl ≈ 320 kJ mol⁻¹, H-Br ≈ 260 kJ mol⁻¹, H-I ≈ 200 kJ mol⁻¹; ranking: H-Cl > H-Br > H-I
D. H-Cl ≈ 310 kJ mol⁻¹, H-Br ≈ 254 kJ mol⁻¹, H-I ≈ 192 kJ mol⁻¹; ranking: H-Br > H-Cl > H-I
Correct Answer
A
Correct Option:
H-Cl ≈ 310 kJ mol⁻¹, H-Br ≈ 254 kJ mol⁻¹, H-I ≈ 192 kJ mol⁻¹; ranking: H-Cl > H-Br > H-I

About This Question

This is Igcse Model Questions Vol1 2022 Chemistry Question 34. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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