Discussion
Completely ionize acids in water are :
Answer: A
The completely ionizing acids are HCl and HNO\(_{3}\).
Hydrochloric acid and nitric acid are strong acids: in dilute aqueous solution practically every molecule gives up its proton, so they ionize completely.
Carbonic acid (H2CO3) and acetic acid (CH3COOH) are weak acids that ionize only slightly; a 0.1 M acetic acid solution is about 1 per cent ionized. Every other option pairs at least one of these weak acids, so only option A contains two acids that ionize completely.
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