Which of the following correctly shows the oxidation numbers for each of the ele

Question

Which of the following correctly shows the oxidation numbers for each of the elements in H2PO4?, I2, and Al(OH)4??


a) H2PO4?: H = +1, P = +5, O = ?2; I2 : I = 0; Al(OH)4? : Al = +3; O = ?2; H = +1
b) H2PO4?: H = +1, P = +5, O = ?2; I2: I = ?2; Al(OH)4?: Al = +3; O = ?2: H = +1
c) H2PO4?: H = +2, P = +5, O = ?2; I2: I = 0; Al(OH)4?: Al = +3; O = ?2; H = +2
d) H2PO4?: H = +1, P = +5, O = ?1; I2: I = 0; Al(OH)4?: Al = +3; O = ?1; H = +1

Explanation / Answer

H2PO4- = 2H+ + P2O4 2- H =+1 O = 2- P=> 2x=(-2-2x4)x(-1) x=+5 ; balancing of charges I2 I=0 I2 molecule has covalent bond Al(OH)4- (OH)- ---> O2- and H+ Al3+ + 4 OH----->Al(OH)4- Al = 4-1 =+3

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