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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya
a
Impure gold is treated with aqueous solution NaCN in the presence of oxygen followed by reduction with zinc metal.
b
Copper pyrites is heated with silica in a Electric are furnace to remove iron.
c
Roasting of Chalcocite produces Malachite.
d
Calcination of Dolomite produces Quick Lime as one of the product.
answer is B, D.
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