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Ionic Compounds: Chemical Formula

The formula f...

Question

The formula for rust is:

A

F e_{2} O_{3} . x H_{2} O

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B

F e O . x H_{2} O

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C

F e_{2} O_{4} . x H_{2} O

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D

F e_{2} O_{2}

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Solution

The correct option is A $F e_{2} O_{3} . x H_{2} O$

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Similar questions

F e C l_{3}

is added to excess of hot water

Q. The chemical formula of rust is

F e_{2} O_{3}

.

Q. Rust is hydrated iron (III) oxide,

{F e}_{2} O_{3} . x H_{2} O

. (reddish brown powder). How is it obtained?

Q. In the following sets of reactants which two sets exhibit the amphoteric character of

A l_{2} O_{3} . x H_{2} O

A l_{2} O_{3} . x H_{2} O

O H^{-} (a q)

A l_{2} O_{3} . x H_{2} O

H_{2} O (l)

A l_{2} O_{3} . x H_{2} O

H^{+} (a q)

A l_{2} O_{3} . x H_{2} O

N H_{3} (a q)

Q. Assertion :The rusting on the surface of iron involves following reaction :
a.

F e (s) \to F e^{2 +} (a q) + 2 e^{-}

(at anodic site)
b.

O_{2} (g) + 4 H^{\oplus} (a q) + 4 e^{-} \to 2 H_{2} O (l)

(at cathodic site)
c.

4 F e^{2 +} (a q) + O_{2} (g) + 4 H_{2} O (l) \to 2 F e_{2} O_{3} (s) + 8 H^{\oplus}

F e_{2} O_{3} (a q) + x H_{2} O (l) \to F e_{2} O_{3} . x H_{2} O

Reason: Rusting is accelerated in the presence of

N a C l

C O_{2}

Read the above assertion and reason and choose the correct option regarding it.

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