Q61 / 180 · AIIMS 2002 · Chemistry

Assertion : All halogens are coloured. Reason : The halogens absorb visible light.

  • Correct answer
    A
    If both the assertion and reason are true and reason is a correct explanation of the assertion.
  • B
    If both assertion and reason are true but assertion is not a correct explanation of the assertion.
  • C
    If the assertion is true but the reason is false.
  • D
    If both assertion and reason are false.

Solution

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. $$ \begin{array}{llll} \mathrm{F} & \mathrm{Cl} & \mathrm{Br} & \mathrm{I} \\ \text { Light } & \text { Yellow } & \text { Reddish } & \text { Deep } \\ \text { yellow } & \text { green } & \text { brown } & \text { violet. } \end{array} $$

Hence, the correct answer is option: 'A'.

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