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Electronic Configuration

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oxidation number of fe2o

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Question 6

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears.

Which of the following is the correct explanation for the observation?

(a) ${KMnO}_{4}$ is an oxidizing agent, it oxidises ${FeSO}_{4}$ .
(b) ${FeSO}_{4}$ acts as an oxidizing agent and oxidises ${KMnO}_{4}$ .
(c) The colour disappears due to dilution; no reaction is involved.
(d) ${KMnO}_{4}$ is an unstable compound and decomposes in presence of ${FeSO}_{4}$ to a colourless compound.

Q. Find the number of ions formed on dissolving one molecule of FeSO

_{4}

_{4}

_{2}

_{4}

_{2}

Q. The amount of

{F e S O}_{4} . {7 H}_{2} O

to be weighed to prepare a solution of 100ml of 0.1 M concentration is:

{F e S O}_{4} . {7 H}_{2} O = 278

Q. The number of electrons in oxygen atom in 0.3 g-molecule of Mohr's salt

{F e S O}_{4} (N H_{4})_{2} {S O}_{4.} {6 H}_{2} O

Q. 32g of a sample of

{F e S O}_{4} . {7 H}_{2} O

where the dissolved in dilute Sulphuric acid and water and it's volume was made up to 1 litre, 25 mL of this solution required 20 mL of 0.02

M K M n O_{4}

solution of complete oxidation. Calculate the weight % of

F e S O_{4} . {7 H}_{2} O

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