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(a) Why does presence of excess of lithium makes LiCl crystals pink ? (b) A solid with cubic crystal is made of two elements P and Q. Atoms of Q are the corners of the cube and P at the body centre. What is the formula of the compound ? |
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Answer» Solution :(a) When a crystal of LiCl is present in EXCESS of lithium, the lithium atom loses an `e^(-)` to from `Li^(+)` ions. The released `e^(-)` diffuse into the crystal and occupies the anionic sites (F-centre). These `e^(-)` input the pink colour to the crystal. (b) We KNOW that in SIMPLE CUBIC number of ATOMS at corner `(1)/(8) xx 8 = 1` and is also body centre. So the formula of compound is PQ. |
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