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Q.

Beryllium is placed above magnesium in the II group. When beryllium dust is added to MgCl2 solution, will

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a

Have no effect

b

Precipitate MgO

c

Precipitate Mg metal

d

Lead to dissolution of Be metal

answer is A.

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Detailed Solution

SRP of Be electrode is greater than SRP of Mg electrode.EBe+2/Beo=-1.92 V and EMg+2/Mgo=-2.37 V Thus Mg+Be2+→Mg2++Be is feasible but reverse is not feasible.At Be electrode reduction occurs while at Mg electrode oxidation occurs. Be is added to Mg no reaction occurs.
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