Verified Answer :

Net ionic equation for
HClO4(aq) + NaOH(aq) --> H2O (l) + NaClO4(aq).

for the molecular equation 

HClO4 (aq) + NaOH(aq) --> H2O (l) + NaClO4 (aq) 

the ionic equation is 

H+ + ClO4- + Na+ + OH- --> H2O(l) + Na+ + ClO4- 

now remove the spectator ions (Na+ and ClO4-) to give the net ionic equation 

H+ + OH- --> H2O(l)

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