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কোন সংকেতটি সঠিক?

[C r B r (H_{2} O)_{6}] B r_{2}

[C o C I_{2} (N H_{3})_{4} S O_{4}

[P t C I (N H_{3})_{6}]^{3 +}

[F e (O H)_{2} (H_{2} O)_{6}]^{+}

[C o (O H) (N H_{3})_{5}]^{2 +}

ANS : 5

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