Cho sơ đồ các phản ứng sau: (1) X1 + H2O

Cho sơ đồ các phản ứng sau:

(1) X₁ + H₂O $\underset{coù\text{m}\text{a}\text{ø}\text{n}\text{g}\text{n}\text{g}\text{a}\text{ê}\text{n}}{\overset{ñieän\text{p}\text{h}\text{a}\text{â}\text{n}\text{d}\text{u}\text{n}\text{g}\text{d}\text{ò}\text{c}\text{h}}{\to }}$ X₂ + X₃ + H₂

(2) X₂ + X₄ $\stackrel{}{\to }$ CaCO₃ + Na₂CO₃ + H₂O

(3) X₂ + X₃ $\stackrel{}{\to }$ X₁ + X₅ + H₂O.

(4) X₄ + X₆ $\stackrel{}{\to }$ CaSO₄ + Na₂SO₄ + CO₂ + H₂O.

1 - __ ; 2 - __ ;3 - __ ; 4- __