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Per NCERT, the cross-over method gives the formula of magnesium chloride as which?
AMg₂Cl₂
BMgCl₂ (Mg²⁺ + Cl⁻ — cross over valencies: Mg gets subscript 1, Cl gets subscript 2)
CMg₂Cl
DMgCl
Answer & Solution
Correct answer: B. MgCl₂ (Mg²⁺ + Cl⁻ — cross over valencies: Mg gets subscript 1, Cl gets subscript 2)
Per NCERT §9.5.2, cross-over of valencies: Mg(2) + Cl(1) → MgCl₂. Charges balance: +2 = (−1)×2.
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