Question

Which of the following is an acid-base reaction?
C(s) + O2(g) → CO2(g)
None of them
2 HClO4(aq) + Ca(OH)2(aq) → 2 H2O(l) + Ca(ClO4)2(aq)
Fe(s) + 2 AgNO3(aq) → 2 Ag(s) + Fe(NO3)2(aq)
MgSO4(aq) + Ba(NO3)2(aq) → Mg(NO3)2(aq) + BaSO4(s)
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Answer 1

Answer: $2HClO_4(aq)+Ca(OH)_2(aq)\rightarrow 2H_2O(l)+Ca(Cl)_4)_2(aq)$

Explanation:

Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

$C(s)+O_2(g)\rightarrow CO_2(g)$  

Neutralization reaction  is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.

$2HClO_4(aq)+Ca(OH)_2(aq)\rightarrow 2H_2O(l)+Ca(Cl)_4)_2(aq)$

Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

Example: $Fe(s)+2AgNO_3(aq)\rightarrow 2Ag(s)+Fe(NO_3)_2(aq)$

Double displacement reaction is one in which exchange of ions take place.  Example: $MgSO_4(aq)+Ba(NO_3)_2(aq)\rightarrow Mg(NO_3)_2(aq)+BaSO_4(aq)$