Five ml of 4N nitric acid, 2 ml of 5N hydrochloric acid and a certain volume of 17M sulphuric acid are mixed together and made upto 2 litre. Thirty ml of this acid mixture exactly neutralize 42.9 ml of sodium carbonate solution containing one gram of Na2CO3.10H2O in 100 ml of water. The amount in gram of the sulphate ions in solution is
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