The following substances are given: CaO. , Cu (OH) 2, HCl, KBr, SO2, H2S, N2O5, which react with sodium hydroxides.

We are given chemical substances: CaO – calcium oxide, Cu (OH) 2 – bivalent copper hydroxide, HCl – hydrochloric acid, KBr – potassium bromide, SO2 – tetravalent sulfur oxide, H2S – hydrogen sulfide, N2O5 – pentavalent nitric oxide.

Consider which of these substances interact with the base with sodium hydroxide. Below are the equations of possible chemical reactions:

NaOH + HCl = NaCl + H2O

NaOH + KBr = NaBr + KOH;

NaOH + SO2 = NaHSO3;

NaOH + H2S = NaHS + H2O

SO2 + NaOH = NaHSO3

H2S + NaOH = NaHS + H2O

N2O5 + 2NaOH = 2 NaNO3 + H2O.

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