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(a)What happens when alkali metals are dissolved in ammonia?
(b)Why is LiF almost insoluble in water whereas LiCl soluble not only in
water but also in acetone?
(c)What is dead burnt plaster? How is it obtained from gypsum?
Class 11 CBSE
Answers
Answer (1)
Alkali metals dissolve in ammonia giving deep blue solution. These solutions are are are conducting in nature as it contains ammoniated cations and electrons. So when energy Falls on these electrons, they moved to a higher energy level by observing energy corresponding to red light from the visible light.
Answer (2)
LiF is insoluble in water. On the contrary, LiCL is soluble not only in water, but also in acetone. This is mainly because of the greater ion character of LiF as compared to LiCL. The solubility of a compound in water depends on the balance between lattice energy and hydration energy.
Answer (3)
Dead burnt plaster is calcium sulphate. It is obtained by heating gypsum. It is then pulverize to form a powder. It is then used in construction and medical industry.
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