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Q.

Each of the following elements forms univalent ions except


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a

Li

b

K 

c

Mg

d

Na

answer is C.

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Detailed Solution

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Each of the following elements forms univalent ions except Mg.
Univalent ions are those ions which possess a charge of +1.lithium( Li), sodium(Na) and potassium ( K) form the charge Li+, Na+ and K+ respectively . And, bivalent cations are positively charged species which possess a charge of 2+ . Magnesium (Mg) forms Mg2+ ion, so it is a bivalent cation.
  
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