Some of the following reagents are used as primary standard I. KMnO_(4 – InterviewSolution

1.	Some of the following reagents are used as primary standard I. KMnO_(4) II. NaOH III . K_(2)Cr_(2)O_(7) IV. FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O V. H_(2)C_(2)O_(4).2H_(2)O Select the primary standard
Answer» II,IV I,II I,III All of these ANSWER :C

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