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Question

Mohr's salt is dissolved in dil.H2SO4 instead of distilled water to?

A
Enhance the rate of dissolution
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B
Prevent cationic hydrolysis
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C
Increase the rate of ionisation
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D
Increase its reducing strength
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Solution

The correct option is B Prevent cationic hydrolysis
Ferrous ions of Mohr's salt undergo hydrolysis in aqueous solution. to prevent the hydrolysis, Conc. H2SO4 needs to be added to the Mohr's salt crystals during the preparation of its standard solution. Another reason is also to prevent the oxidation of Fe2+ ions of Mohr's salt to Fe3+ions.



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