Adding KCl to concentrated sodium dichromate precipitates
ABlue copper sulphate
BOrange-red K2Cr2O7
CPurple KMnO4 salt
DColourless NaCl salt
Answer & Solution
Correct answer: B. Orange-red K2Cr2O7
Potassium dichromate is less soluble than the sodium salt, so orange-red crystals separate.
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