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: 

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: 

  1. A

    Zn

  2. B

    Ca

  3. C

    Al

  4. D

    Fe

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    Solution:

    Al+3H2O(NaOHAl(OH)3+3/2H2(g) White gelatinous ppt. Al(OH)3 excess of NaOHNaAl(OH)4 Soluble 2Al(OH)3(X)ΔAl2O3+3H2O
    Al2O3 is used as adsorbent in chromatography. Thus, metal 'M' is Al.

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