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Why are halogens coloured?...

Why are halogens coloured?

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Halogen molecules absorb light in the visible region by "means of which the outer electrons are excited to higher energy levels. The amount of energy required for the excitation ie., excitation energy. decreases prógressively from fluorine to iodine as the size of the atom increases. Thus there is a progressive decpening of colour from .F. to .L.
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V PUBLICATION-The p-BLOCK ELEMENTS-QUESTION BANK
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  3. Why are halogens coloured?

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  4. Write the reactions of F2 and Cl2 with water.

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  8. Write balanced equations for the following: i. 'NaCl is heated with su...

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  9. How are xenon fluorides 'XeF2, XeF4 and XeF6 obtained?

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  10. With what neutral molecule is 'ClO-' isoelectronic? Is that molecule a...

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  11. .How are 'XeO3 and 'XeOF4' prepared?

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  12. Arrange the following in the order of property indicated for each F2...

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  13. Which one of the following does not exist? i 'XeOF4' iiNeF2 iii XeF iv...

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  15. Why do noble gas have comparatively large atomic sizes?

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  16. List the uses of neon and argon gases.

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