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Find out the total number of reagents(s) which converts chromium (III) ion to chromate ion.
`{:(H_(2)O_(2)"solution",,(NaBO_(3).4H_(2)O+H_(2)O_(2)),),(NaOBr,,FeSO_(4),),(NaOH,,K_(2)S_(2)O_(8)):}`

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Correct Answer - 4
`H_(2)O_(2)` solution, `(NaBO_(3).4H_(2)O+H_(2)O_(2), NaOBr, K_(2)S_(2)O_(8)`

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