context: Although hydrides can be formed with almost all main-group elements, the number and combination of possible compounds varies widely; for example, there are over 100 binary borane hydrides known, but only one binary aluminium hydride. Binary indium hydride has not yet been identified, although larger complexes exist.
question: ఎన్ని బైనరీ బోరేన్ హైడ్రైడ్లు తెలిసినవి?
answers: over 100