ধরি, প্রকৃত ভর =x gm
xMFeSO4.7H2O×তুল্য সংখ্যা=VKMnO4×SKMnO4×OKMnO4
⇒x55.85+32+16×4+7×18×61000×0.02×5
∴x=0.16671 gm Ans.
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