s-Block ElementsHard
Question
Which of the following statement is incorrect ?
Options
A.The superoxide ion (i.e., O2-) is stable only in presence of larger cations such as K, Rb, Cs.
B.Alkali metals are normally kept in kerosene oil.
C.All the alkali metal hydrides are ionic solids with high melting points.
D.The concentrated solution of alkali metals in liquid ammonia are strong paramagnetic in nature.
Solution
(A) Bigger anion is stabilised by bigger cation through lattice energy effect.
(B) Because of their high reactivity towards air and water on account of their higher electropositive character
(C) All alkali metals are highly basic in nature and, therefore, their hydrides are ionic solids with high melting points.
(D) In concentrated solution, unpaired electrons with opposite spins paired up-forming the solution diamagnetic.
(B) Because of their high reactivity towards air and water on account of their higher electropositive character
(C) All alkali metals are highly basic in nature and, therefore, their hydrides are ionic solids with high melting points.
(D) In concentrated solution, unpaired electrons with opposite spins paired up-forming the solution diamagnetic.
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