When metal ' $M$ ' is treated with NaOH , a white gelatinous precipitate ' $X$ ' is obtained, which

Question

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 is used in chromatography as an adsorbent. Then metal ' $M$ ' is\

Professor PC Thomas Classes · Answer

(c) : Metal $M$ could be Al as $\mathrm{Al}(\mathrm{OH})_{3}$ is soluble in excess sodium hydroxide to form hydroxy aluminate ions. $\mathrm{Al}_{2} \mathrm{O}_{3}$ (oxide of metal $M$ ) is used as adsorbent in chromatography.\ \