<span>1)K2Cr207 + 3Na2SO3 + 4H2SO4 ----> K2SO4 + Cr2(SO4)3 +3Na2SO4 + 4H2O</span>
<span><span>2<span>Na3PO4</span></span>+<span>3<span>MgCl2</span></span>→<span>6NaCl</span>+<span>Mg3(PO4)<span>2</span></span></span>↓
1) 2HCI+ 2K = 2KCI + H2 выделятся водород
2) 2HCI + Ba = BaCI2 + H2
3) HCI+ AI = AICI3 + H2