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Assertion : All halogens are coloured.
Reason : The halogens absorb visible light.
Options:
Reason : The halogens absorb visible light.
Solution:
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Verified Answer
The correct answer is:
If both the assertion and reason are true and reason is a correct explanation of the assertion.
All the halogens are coloured. The colour deepens with the rise of atomic number from fluorine to iodine.
The colour is due to the absorption of energy from visible light by their molecules or excitation of outer electrons to higher energy levels.
$$
\begin{array}{llll}
\mathrm{F} & \mathrm{Cl} & \mathrm{Br} & \mathrm{I} \\
\text { Light } & \text { Yellow } & \text { Reddish } & \text { Deep } \\
\text { yellow } & \text { green } & \text { brown } & \text { violet. }
\end{array}
$$
The colour is due to the absorption of energy from visible light by their molecules or excitation of outer electrons to higher energy levels.
$$
\begin{array}{llll}
\mathrm{F} & \mathrm{Cl} & \mathrm{Br} & \mathrm{I} \\
\text { Light } & \text { Yellow } & \text { Reddish } & \text { Deep } \\
\text { yellow } & \text { green } & \text { brown } & \text { violet. }
\end{array}
$$
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