342g of 20% by mass of b a Ba(OH)2 solution (sp. gr.=0.57) is reacted with 1200 mL of 2M HNO3. If the final density of solution is same as pure water then molarity of the iron in resulting solution which decides the nature of the above solution is— (1)0.25M,(2)0.5M,(3)0.888M,(4)none of these.

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