Pick the odd one out regarding the change in a reaction.

Baking a potato

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Rusting of an iron nail

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Burning a piece of paper

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Melting an ice cube

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Ignition of propane

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Solution

The correct option is B Melting an ice cube
Option (D) represents odd one out regarding the change in a reaction. Because melting an ice cube is a physical change where, the solid state is converting to liquid. All other are chemical changes.
(A) After it is cooked, the potato is fluffy and tastes fine because its ingredients get chemically modified due to heat.
(B) Rusting of iron nail is due to formation of iron oxide.
(C) Burning a piece of paper is a chemical reaction. Where carbon in the paper are oxidized into different chemicals like carbon dioxide and water vapor.
(E) Ignition of propane is also a chemical change.

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Similar questions

Q. (1)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?

(2)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(b) Can you change rust back into iron by some simple method?

(3)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(4)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(d) Give two other examples of a similar type of change.

Rusting of iron is an example of a chemical change.

Q. Group the following into physical change and chemical change.

Dissolving salt in

H_{2} O,

burning of a fuel, rusting or iron, melting of ice cube.

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(a) Do you think rust is different from iron?

(b) Can you change rust back into iron by some simple method?

(c) Do you think the formation of rust on iron is a chemical change?

(d) Give two other examples of a similar type of change.

Q. Statement I: If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

Statement II: Rusting of iron is a chemical change.

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