The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a col — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: The metal X is prepared by the electrolysis of its fused chloride, indicating it is an active, highly electropositive s-block metal (such as Ca). Step 2: Calcium reacts with hydrogen gas at high temperatures to form calcium hydride (CaH2), which is a colourless, crystalline ionic solid: Ca + H2 -> CaH2. Step 3: When calcium hydride (CaH2) reacts with water, it undergoes vigorous hydrolysis to produce calcium hydroxide and release hydrogen gas: CaH2 + 2H2O -> Ca(OH)2 + 2H2. Thus, the metal X is calcium, which corresponds to option (b).