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Language of Chemistry — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYLanguage of Chemistry2 Marks
Question
What do you understand by the term variable valency
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Answer

Some elements possess more than one valence. Such elements are said to possess variable valency. For example, iron has two electrons in its outermost shell (valence shell). On donating these electrons, its valency becomes 2.

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