Which is the chemical formulae of the following compound is wrong? (i) Brine solution - NaCl (ii) Baking soda - NaHCO3 (iii) plaster of paris - CaSO4.1/2 H2O (iv) Gypsum - CaSO4.H2O (i) & (iv) (i), (ii) & (iv) (i) & (iv) (ii) & (iv)
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1 and 4 is wrong
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