`H_(2)O_(2)` acts as both oxidising and reducing agent. As oxidising agent, its product is `H_(2)O` but as redusing agent, its product is `O_(2)`. Volume strength has great significance for chemical reactions. The strength of '10 V means 1 volume (or litre) of `H_(2)O_(2)` on decomposition `(H_(2)O_(2) rarr H_(2)O+1/2 O_(2))` gives 10 volumes (or litre) of oxygen at NTP.
`15 g Ba(MnO_(4))_(2)` sample containing inert impurity is completely reacting with 100 mL of '11.2 V' `H_(2)O_(2)`, then what will be the `%` purity of `Ba(MnO_(4))_(2)` in the sample: (Atomic mass: `Ba=137, Mn=55)`

Options

A. (a)`5%`
B. (b)`10%`
C. (c )`50%`
D. (d)None of these

Answer

C

Explanation

milliequivalents of `Ba(MnO_(4))_(2)` reacted= milliequivalents of `H_(2)O_(2)` reacted
`m/375xx10xx1000=11.2/5.6xx100`
`:. M=7.5 g`
:. Wt. of `Ba(MnO_(4))_(2)` in sample`=7.5 g`
`%` purity of `Ba(MnO_(4))_(2)` in sample`=7.5/15xx100=50%`