Answer:
(1 ) acid-base, double replacement
(2) double replacement
(3) combustion, combination
(4) double replacement, precipitation
Explanation:
(1) Recognize this as the reaction of the acid (HI) with the base (NaOH) to produce salt (NaCl) and water.
This reaction is also a double replacement since Na replaces H in HI,and H replaces Na in NaOH.
(2) Here we have a double replacement where Cu replaces Zn in ZnCrO4, and Zn replaces Cu in CuSO4
(3) Here we have the combustion of the organic compound CH3CH2OH (ethanol) with oxygen to produce CO2 and water.
This reaction is also a combination reaction reaction of oxygen with CH3CH2OH
(4) This reaction is also a double replacement where Ag replaces Na in NaCl and Na replaces Ag in AgNO3
The reaction is also a precipitation reaction where a precipitate AgCl is formed from the reaction of aqueous NaCl plus AgNO3 to produce solid AgCl and aqueous NaNO3.
