Element M forms a chloride with the formula $M C l_{2}$ which is a solid with high melting point. M would most likely be in the group in which .................. is placed.

[(a) Na (b) Mg (c) Al (d) Si. ]

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Solution

(b) Mg

The valency of chlorine is 1. Therefore, if the element M is forming a chloride of the formula MCl₂, it means that the valency of M is 2. Also, since the compound MCl₂ has high melting point, it means that it is an ionic compound. Hence M is a metal and belongs to group 2 of the periodic table.

From the formula XCl2 we see that one atom of X combines with 2 atoms of Cl this means X has a valency of 2 just like Magnesium. (Remember the formula of magnesium chloride is MgCl2).
Na has valency 1 (NaCl)
Al has valency 3 (AlCl3)
Si has valency 4 (SiCl4)

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