1.

(i) What are interhalogen compounds ? (ii) Explainthe preparation of KMnO_(4)

Answer»

Solution :(i) Eachhalogen combineswith otherhalogensto forma series of compounds known as interhalogencompounds . Ex :CIF, BrF, `CIF_(3) , BrF_(5) , IF_(7)`
(II) Potassiumpermanganate is preparedfrom pyrolusite` (MnO_(2))`ore. The preparationinvolvesthe followingsteps
(i) Conversion of ` MnO_(2)`to potassiummanganate: Powderedore is fusedwith KOHin the presence of airor oxidisingagentslike` KNO_(3) or KCIO_(3)` . A greencoloured potassium manganate is formed .
` 2MnO_(2) + 2KOH+ O_(2) tounderset(" potassiummanganate (Green)") (K_(2)MnO_(4) + 2H_(2)O)`
(ii)Oxidiation of potassiummanganate to potassiumpermanganate : Potassiummanganate thusobtainedcan beoxidisedin TWOWAYS , eitherby chemicaloxidationor electrolyticoxidation .


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