Question

H2SO4(p) + Sn →HNO3(k) + Hg → HNO3(p) + Na →

Answer 1

Sn+H2SO4(р)-->SnSO4+H2↑
HNO3(к)+Hg-->Hg(NO3)2+2NO2↑+2H2O
Натрий сперва реагирует с водой:
2Na+2H2O-->2NaOH+H2↑
NaOH+HNO3(р)-->NaNO3+H2O