By seeing these options answer the question:-
Carbonic acid is weak acid - Assertion
It is ionized completely in aqueous solution it - Reason

Dear student,
carbonic acid is a weak acid as it ionizes partially in the water .
the reaction is as follows, H2CO3   HCO3-(aq.)   +  H+(aq.) 
  Thus Assertion is true but Reason is, false , option (c) 

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