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Question:

The one that is not a carbonate is:

siderite

calamine

bauxite

malachite

Solution:

Correct option is A. bauxite

  1. Bauxite−AlOx(OH)3−2;x where 0<x<1
  2. Siderite−FeCO3
  3. Calamite−ZnCO3
  4. Malachite−CuCO3.Cu(OH)2.