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JEE Main2018Chemistryp Block Elements (Group 13 & 14)Actual

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. The metal M is

Options

  1. AFe
  2. BZn
  3. CCa
  4. DAl

Correct answer

D. Al

Step-by-step solution

Alumina Al 2 O 3 is used in chromatography Al + NaOH → Al ( OH ) 3 ( gelatinous ) → NaOH ( ex cess ) [ Al ( OH ) 4 ] − ( soluble ) → Δ Al 2 O 3

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