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AIIMS 2002
Exam
AIIMS
Year
2002
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2002 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

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

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

Options

  1. AIf both the assertion and reason are true and reason is a correct explanation of the assertion.
  2. BIf both assertion and reason are true but assertion is not a correct explanation of the assertion.
  3. CIf the assertion is true but the reason is false.
  4. DIf both assertion and reason are false.

Correct answer

A. If both the assertion and reason are true and reason is a correct explanation of the assertion.

Step-by-step 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. FClBrI Light  Yellow  Reddish  Deep  yellow  green  brown  violet. \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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