Mohr salt- FeSO4-NH42-SO4- 6H2O- is preferred over FeSO4- 7H2O for standardization of KMnO4 solution because-

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Coordination and Oxidation Number

Mohr salt, ...

Question

Mohr salt, $F e {S O}_{4} \cdot {({N H}_{4})}_{2} \cdot {S O}_{4} \cdot 6 H_{2} O$ , is preferred over $F e {S O}_{4} \cdot 7 H_{2} O$ for standardization of $K M n O_{4}$ solution because:

Mohr's salt is a double salt wile ferrous sulphate.

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Mohr's salt is not hygroscopic but

F e {S O}_{4} \cdot 7 H_{2} O

is hygroscopic.

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Moh'sr salt contains only ferrous ions whereas ferrous sulphate contains some ferric ions.

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Mohr's salt solution can be titrated even in the absence of

H_{2} {S O}_{4}

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Solution

The correct option is C Moh'sr salt contains only ferrous ions whereas ferrous sulphate contains some ferric ions.
Mohr salt contains only ferrous ions and volume of KMnO4 reacting with Mohr salt solution can be determined as it oxidizes them to ferric ions.

In order to reduce the oxidation of ferric ion Mohr's salt is preferred.

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Similar questions

Q. Ferrous sulphates are salts with the formula -

F e S O_{4} . x H_{2} O

. Most common of these compounds is the heptahydrate -

F e S O_{4} .7 H_{2} O

. When we heat this compound to

300^{\circ} C

, we directly get the anhydrous Iron (II) Sulphate - True or False?

Distinguish by adding : Sodium hydroxide solution and ammonium hydroxide solution to
(a) Calcium salt solution and lead salt solution.
(b) Lead salt solution and zinc salt solution.
(c) Copper salt solution and ferrous salt solution.
(d) Fe(II) salt solution and Fe(III) salt solution.
(e) Ferrous nitrate and lead nitrate

Q. Write the colour of the following salts:
(a) Cuprous salts
(b) Cupric salts
(c) Aluminium salts
(d) Ferrous salts
(e) Ferric salts
(f) Calcium salts

Q. Determine the percentage of water of crystallisation, iron, sulphur and oxygen in pure ferrous sulphate

(F e S O_{4} \cdot 7 H_{2} O)

Q. What is the colour of ferrous sulphate salt?

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Mohr salt, FeSO4⋅(NH4)2⋅SO4⋅6H2O, is preferred over FeSO4⋅7H2O for standardization of KMnO4 solution because:

Mohr salt, $F e {S O}_{4} \cdot {({N H}_{4})}_{2} \cdot {S O}_{4} \cdot 6 H_{2} O$ , is preferred over $F e {S O}_{4} \cdot 7 H_{2} O$ for standardization of $K M n O_{4}$ solution because: