1. Б), Г), Ж), З)
2. Zn, Cl2, O2, O3
3. H2SO4 w(X)=Ar(X)*x/M(AB)
M(H2SO4)= 1*2+32+16*4=98
w(H)=1*2/98=0.02
w(S)=32/98=0.33
w(O)=16*4/98=0.65
M(H3PO4)=1*3+31+16*4=98
w(H)=1*3/98=0.03
w(P)=31/98=0.32
w(O)=16*4/98=0.65
M(Cu(OH)2)=64+(16+1)*2=98
w(Cu)=64/98=0.65
w(O)=16*2/98=0.33
w(H)=1*2/98=0.02
4. (Валентность будет в скобочках)
Сa(II)Br2(I), S(IV)O2(II), As2(V)O5(II), Al2(III)S3(II), Ba3(II)P2(III), Fe(II)O(II).