What is correct for ( 10 mathrm{g} ) of ( mathrm{CaCO}_{3} ) -
(A) It contains ( 1 mathrm{g} ) -atom of carbon
(B) It contains 0.3 g-atoms of oxygen
(C) It contains 12 g of calcium
(D) None of these

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Mole of (CuCO_{3}) in 10g = (frac{10}{100} = 0.1) 

in 1moles (CaCO_{3} - 3mole 0) 

in 0.1 mol ( "   " - 0.3  " 0)

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