Which of the following statements about alkali metals is true?

alkali metals have full valence shells

alkali metals form 1- cations

alkali metals are very reactive

alkali metals form 2- cations

OPTION C, Alkali metals are more reactive.

Explanation:

Since alkali or IA group elements are more electropositive and they readily loose Electrons to form monocation. Hence they are very reactive.

Their valency shell configuration is ns1, incomplete.

They forms only monocations like Na+, K+ etc

Alkaline earth metals forms +2 ions

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

answer; natural resources;