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  4. Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as -

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Q. Element X forms a chloride with the formula $XCl_2$, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as -

Classification of Elements and Periodicity in Properties

Solution:

Elements of group Na form XCl halide.
Elements of group $Mg$ form $XCl _{2}$ halide.
Elements of group $Al$ form $XCl _{3}$ halide.
Elements of group $Si$ form $XCl _{4}$ halide.
As an element, $X$ forms a chloride with the formula $XCl _{2}$, which is solid with a high melting point. $X$ would most likely be in the same group of $Mg$.