Alkali earth metals have lower densities than alkali metals. — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Microcosmic salt is a traditional reagent used in mineral analysis and qualitative chemical bead testing. Step 2: Chemically, this salt is defined as sodium ammonium hydrogen phosphate tetrahydrate. Step 3: Its corresponding chemical formula is Na(NH4)HPO4 . 4H2O, which matches option (b).