CrO3 dissolves in aqueous NaOH to give : — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Chromium trioxide (CrO3) is an acidic oxide (chromic anhydride) in which chromium is in the +6 oxidation state. Step 2: When dissolved in an aqueous strong base like sodium hydroxide (NaOH), it undergoes a neutralization reaction to form a chromate salt. Step 3: The reaction is CrO3 + 2NaOH ---> Na2CrO4 + H2O, which yields chromate ions (CrO4^2-). This matches option (b).