Calculate the equivalent weight of the following:
(i) `KMnO_4` in acidic medium
(ii) `KMnO_4` in alkuline medium
(iii) `FeSO_4 (NH_4)_2 SO_4. 6H_(2) O` (converting to `Fe^(3+)` )
(iv) `K_2 Cr_2 O_7` in acidic medium
(v) `H_2 C_2 O_4` (converting to `CO_2` )
(vi) `Na_(2) S_(2) O_(3). 5H_(2) O` ( reacting with `I_2` )

Explanation

To calculate the equivalent weight of the given compounds, we will use the formula:

**Equivalent Weight = Molecular Weight / n-factor**

Where the n-factor is defined as the change in oxidation number per molecule of the substance involved in the reaction.

Let's go through each compound step by step:

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