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(A) $1$. Transition metal compounds are often coloured due to the presence of unpaired $d$-electrons.$2$. When light falls on these compounds, the $d$

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$d-d$ transitions

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(A) $1$. Transition metal compounds are often coloured due to the presence of unpaired $d$-electrons.$2$. When light falls on these compounds, the $d$-electrons absorb specific wavelengths of visible light to jump from a lower energy $d$-orbital to a higher energy $d$-orbital.$3$. This process is known as a $d-d$ transition.$4$. The light that is not absorbed is transmitted or reflected, which gives the compound its characteristic colour.

Identify the factor responsible for the colour of transition metal compounds.

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