Which species of chromium is toxic in water: (A) Cr+2 (B) Cr+3 (C) Cr + 6 (D) Cr is non-toxic element

Which species of chromium is toxic in water: (A) Cr+2 (B) Cr+3 (C) Cr + 6 (D) Cr is non-toxic element 
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Answer :

(C) Cr + 6
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Compare the following complexes with respect to structural shapes of units, magnetic behaviour and hybrid orbitals involved in units : [Co(NH3)6]+3, [Cr(NH3)6]3+, Ni(CO)4 (At. nos. : Co = 27, Cr = 24, Ni = 28) -Chemistry

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