Igcse Model Questions Vol1 2021 Chemistry Question 39

Practice objective / multiple choice question 39 from the 2021 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 39 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A binary compound HY is formed between hydrogen (electronegativity \(\chi_{\text{H}} = 2.20\)) and a non‑metal Y. Spectroscopic analysis shows that the H-Y bond has a percent ionic character of 15 %. The percent ionic character is related to the electronegativity difference \(\Delta\chi\) by the expression \[\%\,\text{ionic} = \bigl(1 - e^{-0.25(\Delta\chi)^{2}}\bigr)\times100\].\n\n(a) Calculate the electronegativity difference \(\Delta\chi\) for the H-Y bond.\n(b) Determine the electronegativity of Y.\n(c) From the following list of non‑metals, identify Y: nitrogen (\(\chi = 3.04\)), oxygen (\(\chi = 3.44\)), chlorine (\(\chi = 3.16\)), sulphur (\(\chi = 2.58\)).

Answer Options

A. a) \(\Delta\chi = 0.85\); b) \(\chi_{Y}=3.09\); c) chlorine
B. a) \(\Delta\chi = 0.73\); b) \(\chi_{Y}=2.88\); c) sulphur
Correct Answer C. a) \(\Delta\chi = 0.81\); b) \(\chi_{Y}=3.01\); c) nitrogen
D. a) \(\Delta\chi = 0.78\); b) \(\chi_{Y}=2.96\); c) oxygen
Correct Answer
C
Correct Option:
a) \(\Delta\chi = 0.81\); b) \(\chi_{Y}=3.01\); c) nitrogen

About This Question

This is Igcse Model Questions Vol1 2021 Chemistry Question 39. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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