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Match each chemical formula with the correct valency criss-cross result:

A1-A, 2-B, 3-C
B1-B, 2-A, 3-C
C1-C, 2-B, 3-A
D1-A, 2-C, 3-B
Answer & Solution
Correct answer: A. 1-A, 2-B, 3-C
Al2(SO4)3 from Al³⁺ and SO4²⁻. Mg3N2 from Mg²⁺ and N³⁻. (NH4)3PO4 from NH4⁺ and PO4³⁻.
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