Question

Molecular formula of the chlorine of an element X is XCI.this compound is a solid having high melting point .which of the following elements be present in the same group as X.

Answer 1

Hey There!!!


We are given that the Molecular formula of a Chloride is $XCl$. 
Also, the compound has a high melting point. This indicates that $XCl$ must be an Ionic Compund.


Ionic Compounds have high melting points. 



Since $Cl$ has a valency of -1, $X$ must be having a valency +1. 


This means that $X$ would be a Group 1 element of the Periodic Table. These elements are also called Alkali Metals. 


The Alkali Metals include: 

-> Lithium (Li)
-> Sodium (Na)
-> Potassium (K)
-> Rubidium (Rb) 
-> Caesium (Cs) 
[And also the radioactive element Francium (Fr) ]


The corresponding chlorides will be having formulas as :

$LiCl \\ NaCl \\ KCl \\ RbCl \\ CsCl$ 


Since Francium is radioactive, it doesn't form a stable chloride compund. 


So, your answer would include :  Li, Na, K, Rb, Cs



Hope it helps
Purva
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