Решите пожалуууйста!! очень нужнооо!

1)CuO + H2SO4 ---> 

2)Na2So3 + H2SO4 --->

3)Na2S + H2SO4 --->

4)NH4Cl + NaOH --->

5)CaCO3 + HCl --->

6)Na2SiO3 + HCl --->

7)HCl + KOH --->

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