CaCl2 is preferred over NaCl for clearing ice on roads particularly in very cold countries. This is — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Flash bulbs require a metal that burns with an extremely bright, intense white light in an oxygen atmosphere. Step 2: Magnesium wire or ribbon reacts vigorously with oxygen when ignited, forming magnesium oxide and releasing a brilliant white light (2Mg + O2 -> 2MgO). Step 3: Therefore, magnesium is the metal historically and widely used in photographic flash bulbs, corresponding to option (b).