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Physical and Chemical Changes

Rusting of ir...

Question

Rusting of iron is a chemical change because

A

a new substance with new properties is produced.

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B

the chemical composition of reactant is changed.

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C

the change is permanent and cannot be reserved easily.

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D

all of these

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Solution

The correct option is D
all of these

Iron reacts with oxygen in presence of water to give hydrated iron oxide which is known as rust. The change is an irreversible change. And hence, this is a chemical change.

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Q. Sate which of the following pertains to- chemical changes.
a] substance retains its identity
b] The change is permanent
c] No new substance is formed.
d] is easily reversible
e] Produces one or more new substance in its composition.
f] The change is temporary
g] The composition and properties of the original substance are not altered.

Q. Assertion: Tearing of paper is a physical change, although it cannot be reversed.
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Q. Statement (1) : Composition and molecular structure of the reactants can be changed by having a chemical change.
BECAUSE
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2. Precipitation is an example of this.
3. Products have new composition.
4. Composition of substance remains same.
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7. Burning of LPG is an example of this.
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(II) It is a temporary change.
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