А) 2Zn+ O2-> 2ZnO
б) <span>3Fe + 4H2O->Fe3O4 + 4H<span>2
в) </span></span><span>2Hg + Cu(NO3)2-></span><span>Hg2(NO3)2 + Cu
г) </span>2Аl + 3I2 = 2AlI3
Тут восстанавливается и окисляется только вода:
<span>2H2O+2e-> H2+2OH(-)</span>
1- a.b
2 - b
4 - b
5 - c
6 - c
7 - b
8 -d
Больше не знаю)
<span>1)Al(OH)3 + NaOH → Na[Al(OH)4]
</span><span>Na[Al(OH)4] + 4HCl → AlCl3 + NaCl + 4H2O
</span><span>AlCl3 + 3NaOH → Al(OH)3 + 3NaCl
</span><span>2Al(OH)3 t</span>→<span>Al2O3 + 3H2O
</span><span>2Al2O3 </span>→<span> 4Al + 3O2
2)</span><span>Cr2(SO4)3 + 6NaOH → 2Cr(OH)3 + 3Na2SO<span>4
</span></span><span>2Cr(OH)3 </span> t→<span>Cr2O3 + 3H2O
</span><span>Cr2O3 + 2Al </span> t→<span>2Cr + Al2O3
</span>Cr + 2HCl t→2<span>CrCl2 + H2
</span>4CrCl2 + O2 + 4HCl → 4CrCl3 + 2H2O
<span>CrCl3 + 6NaOH → Na3[Cr(OH)6] + 3NaCl</span>