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** Q 2660680515. ** Calculate the amount of `CaCl_2` (molar mass = 111 g `mol^-1`) which must be added to 500 g of water to lower its freezing point by 2 K, assuming `CaCl_2` is completely dissociated. (`K_f` for water `= 1.86 K kg mol^-1`)

**CBSE-12th 2015 **