Which of the following salt does not impart colour to the flame? — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Flame coloration occurs when valence electrons are excited to higher energy levels by the flame's heat and emit visible light upon returning to the ground state. Step 2: Beryllium (Be) and Magnesium (Mg) have very small atomic sizes and exceptionally high ionization energies. Step 3: The heat of a Bunsen burner flame is insufficient to excite the tightly held valence electrons of Mg^2+. Thus, MgCl2 does not impart any color to the flame, matching option (a).