s-Block ElementsHard
Question
Dilute solutions of alkali metals in liquid ammonia :
Options
A.are powerful reducing agents.
B.are paramagnetic.
C.are good conductor of electricity better than any salt in any liquid.
D.on evaporation yield the metals.
Solution
(A) The solution of metals in liquid ammonia act as powerful reducing agents (it even reduces the aromatic ring) due to the presence of solvated unpaired electrons.
O2 + e- → O2- ; O2 + 2e- → O22- (change of oxidation states from 0 to - 1).
(B) Very dilute solutions of the metals are paramagnetic, with approximately one unpaired electron per metal atom (corresponding to one solvated electron per metal atom)
(C) Dilute solutions conduct electricity better than any salt in any liquid and the conductivity is similar to that of the pure metals. Conduction is due mainly to the presence of solvated electrons.
(D) Evaporation of the ammonia from solutions of alkali metals yields the metal.
O2 + e- → O2- ; O2 + 2e- → O22- (change of oxidation states from 0 to - 1).
(B) Very dilute solutions of the metals are paramagnetic, with approximately one unpaired electron per metal atom (corresponding to one solvated electron per metal atom)
(C) Dilute solutions conduct electricity better than any salt in any liquid and the conductivity is similar to that of the pure metals. Conduction is due mainly to the presence of solvated electrons.
(D) Evaporation of the ammonia from solutions of alkali metals yields the metal.
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