11. A metal M readily forms its sulphate MS04 which is water soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hydroxide M(OH)2 which is soluble in NaOH solution. Then M is

Based on the given information, we can determine the identity of the metal M by analyzing its properties:

1. Metal M readily forms its sulphate MS04, which is water soluble. This indicates that M is a metal that can react with sulfuric acid to form a soluble sulfate.

2. Metal M forms its oxide MO, which becomes inert on heating. This suggests that M is a metal that can react with oxygen to form an oxide, but the oxide does not undergo any further reactions when heated.

3. Metal M forms an insoluble hydroxide M(OH)2, which is soluble in NaOH solution. This implies that M is a metal that can react with water to form an insoluble hydroxide, but the hydroxide can dissolve in a strong base like sodium hydroxide.

Based on these properties, the metal M can be identified as calcium (Ca). Calcium readily forms calcium sulfate (CaSO4), which is water soluble. It forms calcium oxide (CaO), which is inert when heated. It also forms calcium hydroxide (Ca(OH)2), which is insoluble but can dissolve in NaOH solution.