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S(1)interstitial compound have high melt...

`S_(1)`interstitial compound have high melting points, higher than those of pure metals.
`S_(2)` Permanganate titration in presence of hydrochloric acid are unsatisfactory
`S_(3)`: `KmnO_(4)` does not act as an oxidising agent in strong alkaline medium.
`S_(4):KMnO_(4)` On heating in a current of `H_(2)` gives `MnO`

A

TTFT

B

TFFT

C

TFTT

D

FFTF

Text Solution

Verified by Experts

The correct Answer is:
A
`S_(1)`: Due to strong interatomic forces.
`S_(2)`: Some of the hydrochloric acid is oxidised to chlorine and thus we get less volume of `KMnO_(4)` than the actual one.
`S_(3)`: `MnO_(4)^(-)+e^(-)overset(OH^(-))toMnO_(4)^(3-)` ltBrgt `S_(4):2KMnO_(4)+5H_(2)to2KOH+2MnO+H_(2)`
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KMnO_(4) is a strong oxidising agent in acidic medium. To provide acidic medium H_(2)SO_(4) is used instead of HCl. This is because

A : In alkaline medium, KMnO_(4) acts as powerful oxidising agent. R : KMnO_(4) reduces to give Mn^(2+) in alkaline medium.

Statement-1: Equivalent mass of KMnO_(4) is equal to one-third of its molecular mass when it acts as an oxidising agent in an alkaline medium. Statement-2: Oxidation number of Mn is +7 in KMnO_(4) .

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Number of electrons transferred in each case when KMnO_(4) acts as an oxidising agent to give MnO_(2),Mn^(2), Mn(OH)_(3) and MnO_(4)^(2-) are respectively: