Concentrated ${{H}_{2}}S{{O}_{4}}$ cannot be used to dry moist ${{H}_{2}}$ gas. Why?

CBSE Class 11 CBSE Class 11 Chemistry
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Cone.${{H}{2}}S{{O}{4}}$ on absorbing ${{H}{2}}$O from moist ${{H}{2}}$ gas produces so much heat that ${{H}_{2}}$ gas catches fire.