Question
Question: The anionic sites occupied by unpaired electrons are called F-centres or colourcentres. They imparts...
The anionic sites occupied by unpaired electrons are called F-centres or colourcentres. They imparts (X)colour to the crystals of NaCl. Excess of lithium makes LiCl crystals and crystals (Y)and excess of potassium makes KCl crystals (Z). (X) , (Y) and (Z) are
A
Yellow, green and pink respectively
B
Pink, yellow and violet (or lilac) respectively
C
Yellow, pink and violet (or lilac) respectively.
D
Red, yellow and pink respectively.
Answer
Yellow, pink and violet (or lilac) respectively.
Explanation
Solution
F – centres impart yellow colour to the crystals of NaCl when heated in an atmosphere of sodium vapour. Similarly, excess of lithium makes LiCl crystals pink and excess of potassium makes KCl crystals violet (or lilac).