Statement 1: Solids having more F-centres possess intense colours. Statement 2: Excess of Na+ in NaCl solid having F-centres makes it appear pink.
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a
Both Statement 1 and Statement 2 are true
b
Both Statement 1 and Statement 2 are false.
c
Statement 1 is true but Statement 2 is false.
d
Statement 1 is false but Statement 2 is true.
answer is C.
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Detailed Solution
Excess Na+ in NaCl solid at F-centres develops yellow colours. The electrons trapped in anionic vacancies absorb energy of visible light giving yellow colour to NaCl ,pink colour to LiCl and lilac colour to KCl