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$Ti^{3+}(aq)$ is violet while $Ti^{4+}(aq$) is colourless because$−$

• A
  There is no crystal field effect in $Ti^{4+}$
• B
  There energy difference between $t_{2g}$​ and eg​ of $Ti^{4+}$ is quite high and does not fall in the visible region.
• C
  $Ti^{4+}$ has $d^0$ configuration.
• ✓
  $Ti^{4+}$ is very small in comparison to $Ti^{3+}$ and hance does not absorb any radiation.