Home › NEET UG › Chemistry › d- and f-Block Elements › The oxidation state of chromium in both CrO₄²⁻ a…
The oxidation state of chromium in both CrO₄²⁻ and Cr₂O₇²⁻ is:
A+6 (same in both species)
B+5
C+3
D+7
Answer & Solution
Correct answer: A. +6 (same in both species)
Chromate (CrO₄²⁻): x + 4(−2) = −2 → x = **+6**. Dichromate (Cr₂O₇²⁻): 2x + 7(−2) = −2 → 2x = 12 → x = **+6**. Inter-conversion is just by pH (alkaline ↔ acidic), no change in Cr oxidation state.
Related questions
Which of the following coordination compounds shows OPTICAL ISOMERISM?The HEXACYANIDOFERRATE(II) ion $[\mathrm{Fe(CN)_6}]^{4-}$ contains iron in oxidation state$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in thiCoordination compounds of transition metals are often COLOURED. CFT explains this colour aWhich of the following best states the CHELATE EFFECT?Cis-trans isomerism is observed in$[\mathrm{Fe(CN)_6}]^{4-}$ has $\mathrm{CN^-}$ ligands, which are STRONG-FIELD ligands. ThIn CRYSTAL FIELD THEORY (CFT) for an OCTAHEDRAL complex, the five degenerate d-orbitals of