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Al(No3)3--------Al(+III), N(+V), O(-II)
Ca3(PO4)2-----Ca(+II), P(+V), O(-II)
HNO3-----------H(+I), N(+V), O(-II)
MgS-------------Mg(+II), S(-II)
B)
HClO4----------H(+I), Cl(+VII), O(-II)
SiO2------------Si(+IV), O(-II)
HBr------------H(+I), Br(-I)
NaH-----------Na(+I), H(-I)
c)
Zn2+----------Zn(+II)
Cu+-----------Cu(+I)
a) Al(No3)3; Al=III, N=V; O=-II
Ca3(PO4)2; Ca=II; P=V; O=-II
HNO3; H=I; N=V; O=-II
MgS; Mg=II; S=-II
B)
HCLO4; H=I; Cl=VII, O=-II
SiO2; Si=IV, O=-II
HBR; H=I, Br=-I
NaH; Na=I; H=-I
c)Zn2+ = II
Cu+ =I