Which of the following is true regarding rusting?

It is a slow chemical reaction.

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It occurs only in iron.

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It is called a mild combustion process.

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It takes place in the absence of oxygen.

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Solution

The correct options are
A
It is a slow chemical reaction.

B
It occurs only in iron.

C
It is called a mild combustion process.

Rusting is a slow chemical reaction.It takes place in the presence of oxygen and moisture.It occurs only in iron.It involves the release of a little amount of heat but no light hence it is called a mild combustion process.It is an irreversible reaction.

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Similar questions

Q. The process of combustion in the absence of oxygen is called:

Q. The table below gives the difference between respiration and combustion. One of the entries in the table is wrong. Which one is it?

	Respiration	Combustion
a.	Respiration is a slow process.	Combustion is relatively a fast process.
b.	Respiration takes place at the body temperature.	Combustion takes place at the ignition temperature of the fuel.
c.	Respiration produces CO₂ + H₂O and energy.	Combustion of hydrocarbons always produces only CO₂.
d.	Respiration takes place inside a cell.	Combustion takes place outside a cell.
e.	Respiration takes place at all times.	Combustion only takes place when a fuel or a combustible substance burns.

Q. Which of these is not true?

(a) Combustion is a faster process than respiration.
(b) Combustion occurs at a higher temperature than respiration.
(c) In combustion, energy is released in several steps, whereas in respiration it is released in a single step.
(d) Combustion can occur anywhere but respiration only occurs in living cells.

Q. Which of the following processes cannot take place in the absence of oxygen?

Burning of a candle is a chemical as well as physical change, why?

1. The physical change occurs when the wax of candle melts and it loses its shape
2. The chemical change is combustion of fuel in presence of oxygen. This leads to the production and emission of carbon dioxide from the flame
3. The burning of a candle is only a chemical change
4. The burning of a candle is only a physical change

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