Conc. H2SO4 cannot be used to prepare pure HBr from NaBr. — p Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: The reaction of sodium borohydride (NaBH4) with boron trifluoride (BF3) in anhydrous ether solvent is a standard laboratory preparation for diborane gas. Step 2: The balanced chemical reaction is: 3NaBH4 + 4BF3 -> 2B2H6 + 3NaBF4. Step 3: Since diborane (B2H6) is the only gaseous product generated at room temperature under these conditions, the correct option is (c).