rain is falling vertical downwords with speed 4meters/per hour . a girl moves on the skitroles with a vertical of 3km /per hour .the abporent velocity of rain with respecth to the girl is
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A solution of 1.5g mass of iron ore was prepared by dissolving H2SO4 in a solution of 100ml. 22ml of 0.02M
K2Cr2O7 solution is required to titrate 25ml of the obtained solution. What is the percentage of pure iron??
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