I. Nitric acid is used in the preparation of aquaregia. II. Salts of – InterviewSolution

1.	I. Nitric acid is used in the preparation of aquaregia. II. Salts of nitric acid are used in photography. III. About 50% of earth atmosphere contains dinitrogen gas. IV. CO_(2) is the principle gas of atmosphere.
Answer» I and II only III and IV only III, II, IV and I I, II, III and IV Answer :A::D

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