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. In an inorganic compound , mass % of O =39.18, K = 3184 and Cl = 28.98. If molecular weight of the inorganic compound is 122.5, what is its molecular formula ? 19. 1.5 g of impure sodium sulphate on treating with excess of barium chloride solution gives 1.74 g BaSO4. What is the % purity of sodium sulphate in the sample? 20. Calculate the weight of Fe obtained by reducing 1 kg of ferric oxide. [Ans : 0.7 kg] 21. 10g sample of impure H2SO4. is treated with 7g chalk. The chalk left unreacted is 2.2 g. Calculate the % purity of H2SO4. 22. 1.2 g sample of impure sodium chloride on treatment with excess of AgNO3 solution gave 2.4g AgCl. Calculate the % purity of sodium chloride sample.

    • Posted by Lakshita Singh 7 years, 6 months ago

    CBSE > Class 11 > Chemistry
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