Yeah, agree with Shubham.
Concentrated Sulfuric acid absorbs water avidly and is an effective drying agent for
gases.
Because the hydration of sulfuric acid is thermodynamically favorable, sulfuric acid is an excellent dehydrating agent
It dehydrates HNO3(nitric acid) too forming nitronium ion NO2+
HNO3 + 2H2SO4 → NO2+ + H3O+ + 2HSO4+