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Rajasthan PETRajasthan PET 2011
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Solution:
Stronger Lewis acid, SbF5 displaces the weaker one (MnF4) from its salt. MnF4 is unstable and readily decompose to give MnF3 and fluorine. K2MnF6+2SbF52KsbF5+unstableMnF4 2MnF42MnF3+F2