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  • Identify the incorrect statement.  Option: 1 Alkali metals are normally kept in kerosene oil

Identify the incorrect statement.

 

Option: 1

Alkali metals are normally kept in kerosene oil


Option: 2

All the alkali metal hydrides are ionic solids with high melting points


Option: 3

The superoxide ion (i.e. \, \, \mathrm{O}^{-2} ) is stable only in the presence of larger cations such as \mathrm{K}^{+}, \mathrm{Rb}^{+}, \mathrm{Cs}^{+}


Option: 4

The concentrated solution of alkali metals in liquid ammonia is paramagnetic in nature


Answers (1)

best_answer

Because of high reactivity towards air and water, alkali metals are kept in Kerosene. 

Alkali metals form ionic hydrides due to their lower electropositive nature with respect to hydrogen. These ionic solids will have high melting point. 

Bigger anion is stabilised by bigger cation through lattice energy effect. Hence, the superoxide ion is stable only in the presence of larger cations.

In concentrated solution, unpaired electrons with opposite spins paired up and makes the solution diamagnetic. Thus option (4) is a wrong statement.

 

Posted by

Gautam harsolia

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