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  • Identify the elements with the following property and arrange them in increasing order of their reactivity (a) An element which is a soft and reactive metal (b) The metal which is an important constituent of limestone (c) The metal which exists in liquid

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

(a) An element which is a soft and reactive metal
(b) The metal which is an important constituent of limestone
(c) The metal which exists in liquid state at room temperature

Answers (1)

a) Sodium (Na) and Potassium(K) belong to alkali metals which are highly reactive due to their electro positive nature and these elements are so reactive that these are kept in kerosene so that they won’t react with oxygen or moisture in air. 
b) Limestone is CaCO3: Calcium is the only metal in its molecule.  Therefore, calcium is the most important metal in limestone.
c) Mercury is the only metal which exists as liquid in room temperature.

Order of reactivity        Mercury (Hg) < Calcium (ca) <sodium (Na)

 

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