Given below are two statements.
Statement I : Iron (III) catalyst, acidified $$\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$$ and neutral $$\mathrm{KMnO}_{4}$$ have the ability to oxidise $$\mathrm{I}^{-}$$ to $$\mathrm{I}_{2}$$ independently.
Statement II : Manganate ion is paramagnetic in nature and involves $$\mathrm{p} \pi-\mathrm{p} \pi$$ bonding.
In the light of the above statements, choose the correct answer from the options given below.
The total number of $$\mathrm{Mn}=\mathrm{O}$$ bonds in $$\mathrm{Mn}_{2} \mathrm{O}_{7}$$ is __________.
Match List I with List II.
List I Pollutant |
List II Disease/sickness |
||
---|---|---|---|
(A) | Sulphate (>500 ppm) | (I) | Methemoglobinemia |
(B) | Nitrate (>50 ppm) | (II) | Brown mottling of teeth |
(C) | Lead (>50 ppb) | (III) | Laxative effect |
(D) | Fluoride (>2 ppm) | (IV) | Kidney damage |
Choose the correct answer from the options given below :
Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R.
Assertion A: [6] Annulene, [8] Annulene and cis-[10] Annulene, are respectively aromatic, not-aromatic and aromatic.
Reason R: Planarity is one of the requirements of aromatic systems.
In the light of the above statements, choose the most appropriate answer from the options given below.