When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which a white gelatinous precipitate 'X' is obtained When metal 'M' is treated with NaOH which is soluble in excess of NaOH. Compound 'X' when heated [...]