Identify the elements with the following property and arrange them in increasing order of their reactivity. 

(i) An element which is a soft and reactive metal. 

(ii) The metal which is an important constituent of limestone. 

(iii) The metal which exists in liquid state at room temperature.

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1 Answers

(i) Na or K 

(ii) Ca 

(iii) Hg 

Reactivity order: Hg < Ca < Na < K

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