# data[].attributes.body
time taken for the reaction to complete in set 1 is higher than set 2. the factor affecting the rate of reaction in set 2 is the concentration of hydrochloric acid used. when the concentration of hydrochloric acid is higher in set 2 than set 1, the number of hydrogen ions per unit volume is higher in set 2 than set 1. thus the frequency of collision between hydrogen ions and zinc atom in set 2 is higher than set 1. therefore, the frequency of effective collision between hydrogen ions and zinc atoms in set 2 is higher than set 1. therefore the rate of reaction in set 2 is higher than set 1

# data[].attributes.body
set 1 ; 0.5 mol
set 2 ; 1.0 mol