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A plane flying north at 500 mph passes over a city at 12 noon. a plane flying east at the sae altitude passes over the same city at 12:30 P.M. The plane is flying east at 400 mph. To the nearest hundred miles, how far apart the two planes at 2 P.M.? 600 m i l e s b. 1000 m i l e s c. 1100 m i l e s d. 1200 m i l e s e. 1300 m i l e s

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In iodometric titrations, an oxidizing agent such as KNnO_(4), K_(2)Cr_(2)O_(7),CuSO_(4),H_(2)O_(2) is allowed to react in neutral medium or in acidic medium with excess of potassium iodide to liberate free iodine Kl+ oxidizon agent to l_(2) Free iodine is titrated against stanard reducing agent usually with sodium thiosulphate i.e., K_(2)Cr_(2)O_(7)+6Kl+7H_(2)SO_(4)toCr_(2)(SO_(4))_(3)+4K_(2)SO_(4)+7H_(2)O+l_(2) 2CuSO_(4)+4Kl to Cu_(2)l_(2)+2K_(2)SO_(4)+l_(2) l_(2)+Na_(2)S_(2)O_(3)to 2Nal+Na_(2)S_(4)O_(6) In iodometric titrations, starch solution is used as an indicator. Starch solution gives blue or violet colour with free iodine. At the end point, blue or violet colour disappear when iodine is completely changed to iodide. A 1.1g sample of copper ore is dissovled and Cu^(2+) (aq.) is treated with Kl.l_(2) liberated required 12.12mL of 0.1M Na_(2)S_(2)O_(3) solution for titration. The % Cu in the ore in the ore is: