• # question_answer Pure hydrogen is obtained by carrying electrolysis of A) Water containing ${{H}_{2}}S{{O}_{4}}$ B) Water containing NaOH C) $Ba{{(OH)}_{2}}$ solution D) KOH solution

Pure hydrogen is obtained by the electrolysis of $Ba{{(OH)}_{2}}$ solution in a U-tube using nickel electrode. The gas is liberated at the cathode and is passed over heated platinum gauze to remove oxygen if present as impurity.