{"id":85529,"date":"2025-06-01T03:19:52","date_gmt":"2025-06-01T03:19:52","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85529"},"modified":"2025-06-01T03:19:52","modified_gmt":"2025-06-01T03:19:52","slug":"which-one-of-the-following-has-the-highest-ionic-character","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-has-the-highest-ionic-character\/","title":{"rendered":"Which one of the following has the highest ionic character?"},"content":{"rendered":"

Which one of the following has the highest ionic character?<\/p>\n

[amp_mcq option1=”BeF\u2083” option2=”SiO\u2082” option3=”NCl\u2083” option4=”K\u2082S” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2024<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nAmong the given options, K\u2082S has the highest ionic character.
\n<\/section>\n
\nIonic character is primarily determined by the electronegativity difference between the bonded atoms. A larger electronegativity difference leads to a more ionic bond. Bonds between highly electropositive metals (Group 1 and 2) and highly electronegative non-metals (Group 16 and 17) are generally ionic.
\n<\/section>\n
\nApproximate electronegativity values: K (0.8), S (2.5), Be (1.5), F (4.0), Si (1.9), O (3.4), N (3.0), Cl (3.2).
\nElectronegativity differences:
\n– BeF\u2083 (assuming Be-F bond in a compound): |4.0 – 1.5| = 2.5. Be compounds often show significant covalent character due to Be\u00b2\u207a’s high charge density.
\n– SiO\u2082 (Si-O bond): |3.4 – 1.9| = 1.5. SiO\u2082 is a covalent network solid.
\n– NCl\u2083 (N-Cl bond): |3.2 – 3.0| = 0.2. This is a covalent molecule.
\n– K\u2082S (K-S bond): |2.5 – 0.8| = 1.7. K is a Group 1 metal, S is a non-metal. The bond is predominantly ionic.
\nWhile Be-F bond has a larger electronegativity difference, K\u2082S is formed between a highly electropositive alkali metal (K) and a chalcogen (S), resulting in a typical ionic compound with K\u207a and S\u00b2\u207b ions in an ionic lattice. K\u2082S exhibits more characteristics of an ionic compound compared to BeF\u2082 (often described as having significant covalent character or being polymeric\/covalent in gaseous state) or the definitively covalent SiO\u2082 and NCl\u2083.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following has the highest ionic character? [amp_mcq option1=”BeF\u2083” option2=”SiO\u2082” option3=”NCl\u2083” option4=”K\u2082S” correct=”option4″] This question was previously asked in UPSC CDS-1 – 2024 Download PDFAttempt Online Among the given options, K\u2082S has the highest ionic character. Ionic character is primarily determined by the electronegativity difference between the bonded atoms. A larger electronegativity … <\/p>\n

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