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The compounds containing complex oxyanion $CrO_4^{2-}$ are intensely yellow coloured because

• A
  Chromium ion in $CrO_4^{2-}$ is a transition metal ion
• B
  $Cr$ and $O$ are $\pi -$ bonded and the allowed $\pi \to \pi ^*$ transition occurs in the visible region
• ✓
  $Cr\to O$ charge transfer is responsible for yellow colour
• D
  Compounds have strong absorption at $ \sim $$\,640\,nm$