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In an electrovalent (ionic) compound MgCl2, magnesium and chlorine ions exist as:
AMg2+ and 2 Cl-
BMg+ and Cl2-
CMg- and Cl+
DMg2- and Cl+
Answer & Solution
Correct answer: A. Mg2+ and 2 Cl-
1. Magnesium has 2 valence electrons and loses both to form Mg2+.
2. Each chlorine atom gains one electron to form Cl-.
3. To balance one Mg2+, two Cl- ions are needed.
4. So the formula unit is Mg2+ + 2 Cl-.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 2 'Chemical Bonding'_
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