Organic Chemistry – Some Basic Principles and Techniques

Organic Chemistry – Some Basic Principles and Techniques

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. The metal ‘M’ is

  • Fe

  • Zn

  • Ca

  • Al

Answer

D.

Al

Al + 3H2O NaOH Al(OH)3 + 32H2 (g)Al(OH)3  Al2O3 + 3H2O

Al(OH)3 = white gelatinous ppt.soluble in excess of NaOH and form Na[Al(OH)4]

Al2O3 used as an adsorbent in chromatography So metal is Al.

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