ANS:A - 60

The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is typically about 60%. In the Ostwald process, which is commonly used for the industrial production of nitric acid, ammonia is oxidized to nitrogen monoxide (NO) and then further oxidized to nitrogen dioxide (NO2). The nitrogen dioxide is absorbed in water to form nitric acid (HNO3). The resulting nitric acid solution typically has a concentration of around 60% by weight. This concentration is commonly used in various industrial applications.