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Preparations and Uses of Caustic Soda

When some iro...

Question

When some iron objects are kept in moist air for a few days, their surface gets coated with a reddish-brown powdery mass. What is the chemical name given to this mass?

A

Hydrated copper oxide.

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B

Hydrated iron oxide.

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C

Hydrated zinc oxide.

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D

Hydrated calcium oxide.

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Solution

The correct option is B
Hydrated iron oxide.

The coating on the iron object is called rust. This layer of rust forms in the presence of air and moisture. The chemical name given to rust is called hydrated iron oxide.

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Similar questions

Q. Rust is hydrated iron (III) oxide,

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

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

Q. Assertion :Zinc is used for galvanising iron. Reason: Rust is hydrated ferric oxide.

Slow oxidation of iron to form hydrated iron oxide is called:

_________ is defined as a process where materials, usually metals, deteriorate as a result of a chemical reaction with air, moisture, chemical, etc. For example, iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide.

Q. Fill in the blanks:
1. ........................ is hydrated ferric oxide.
2. ........................ is used for galvanising iron.
3. We get ........................ by the process of crystallisation.
4. A chemical change is usually ........................ and permanent.
5. All chemical changes involve ........................ or ........................ of energy.

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Preparations and Uses of Caustic Soda

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