<span><span>4NH3</span> + 5O2 = <span>4NO</span> + 6H2O</span>
<span>
<span><span>ОВР :
</span></span></span>
<span><span><span><span><span><span>Восстановление:<span><span>
O + <u>2</u>e− = O2−
</span></span>
Окисление:<span><span>
N3− − <u>5</u>e− = N2+ </span></span></span></span><span><span><span><span /></span></span></span></span></span><span><u>
5</u>O + <u>2</u>N3− = <u>5</u>O2− + <u>2</u>N2+</span></span></span><span> </span>
Mg3(PO4)2 выпадает в осадок
<span> 5H₂SО₄+8Na= 4Na₂SО₄+4H₂O+H₂S</span>
<span>Cr(3+)PO4(3-), Ni(2+)(NO3)2,(-) K2(+)Cr2O7(2-), AlOH(2+)SO4(2-), Ba(2+)HPO4(2-)</span>
A) C+2H2SO4=2SO2+CO2+2H2O
C(0)-4e=C(+4)
S(+6)+2e=S(+4)
б) 3C+4HNO3=4NO+3CO2+2H2O
C(<span>0)-4e=C(+4)
N(+5)+3e=N(+2)</span>