17. Identify the positively charged sol. : (a) Haemoglobin (blood) (b) Clay (c) As2S3 (d) Gold sols. 1. The ore chromite is : (a) FeCr2O4 (b) CoCr2O3 (c) CrFe2O4 (d) FeCr2O3 2. When lime stone is heated, CO2 is given off. The metallurgical operation is : (a) Smelting (b) Reduction (c) Calcination (d) Roasting
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