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Reactivity Towards Halogens

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Q. When potassium permanganate is titrated against ferrous ammonium sulphate, the equivalent weight of ferrous ammonium sulphate is :

(a) M (b) M/2 (c) M/5 (d) M/3

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Solution

Dear Student,

$K M n O 4 w h e n t i t r a t e d w i t h f e r r o u s a m m o n i u m s u l p h a t e (A c i d c S a l t) g i v e s t h e f o l l o w i n g c h a n g e s 5 F e^{+ 2} + M n O 4^{-} \to 5 F e^{+ 3} + M n^{+ 2}$
The change in oxidation number of Fe = 1
t $H e n c e e q u i v a l e n t w t f e r r o u s a m o n i u m s u l p h a t e = M . w t . / V a l e n c y F a c t o r = M / 1$
= M
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