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Question

Arrange them in the increasing order of their pH value:
LiF,KI,MgCl2

A
MgCl2<KI<LiF
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B
MgCl2<LiF<KI
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C
LiF<MgCl2<KI
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D
KI<MgCl2<LiF
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Solution

The correct option is A MgCl2<KI<LiF
A salt of strong acid and weak base has a pH less than 7 while a salt of weak acid and strong base has a pH greater than 7.
So according to this logic pH order is:
MgCl2<KI<LiF

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