Answer
$Ca(H_{2}PO_{4})_{2}$, Oxidation state of Phosphorus is +5
Work Step by Step
Net oxidation state of a compound is 0, hence:
Ca: +2 x 1 = +2 , H: +1 x 4 = +4, O: -2 x 8 = -16, hence P should have oxidation state of +5 (+5 x 2 = +10)
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 22 - Chemistry of the Nonmetals - Exercises - Page 993: 22.60d
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