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In the replacement reaction

The reaction will be most favourable if $M$ happens to be
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The reaction will be most favourable if $M$ happens to be
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The correct answer is:
$\mathrm{Rb}$
For the reaction,
The reaction will be faster with $\mathrm{Rb}$ because lattice energy of RbF is less than LiF, NaF, KF.
The reaction will be faster with $\mathrm{Rb}$ because lattice energy of RbF is less than LiF, NaF, KF.
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