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  • Mark the correct statement.   Option: 1 Alkali metals react with <img alt="H_{2}" src="https://entrancecorner.oncodecogs.com/gif.

Mark the correct statement. 

 

Option: 1

Alkali metals react with H_{2} to form hydrides

 


Option: 2

Rubidium and cesium form superoxides

 


Option: 3

Cesium is most reactive among alkali metals

 


Option: 4

All of the above. 


Answers (1)

best_answer

Alkali metals react with H_{2} at about 673 K (Li at 1073 K) to form hydrides.  

On reaction with oxygen, Rubidium forms Rubidium superoxide which is a dark brown solid whereas Cesium forms Cesium Superoxide (CsO_{2}) which is a dark yellow or orange solid. 

The reactivity of alkali metals increases as we move down the group due to their larger size and low ionization enthalpy. Thus, Cs is highly reactive among alkali metals. 

Hence, (4).

Posted by

Rakesh

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