A metal is burnt in air and the ash on moistening smells of NH3. The metal is : — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Radium is the heaviest alkaline earth metal (at the bottom of Group 2) with valence configuration 7s^2. Step 2: Basic character of hydroxides increases down Group 2 as cationic size increases and ionization energy decreases. Thus, Ra(OH)2 is a highly basic hydroxide, not amphoteric. Step 3: Therefore, the statement that the hydroxide is amphoteric is incorrect, which corresponds to option (c).