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JEE Main Test 49

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JEE Main Test 49
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  • Question 1
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    The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is

    Solution

    K2Cr2O7 + 7H2SO4 + 6KI → Cr2(SO4)3 + 3I2 + 4K2SO4 + 7H2O

    Potassium dichromate reacts with potassium iodide in the presence of sulphuric acid to produce chromium(III) sulphate, iodine, potassium sulphate and water. 
    The colour change is from orange to green.

     

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