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Standard VII
Chemistry
Chemical Change
Question

Rusting of iron is a chemical change because:
  1. it is temporary
  2. it is a slow reaction
  3. it can be cleaned and the original substance recovered
  4. a new substance is formed

A
a new substance is formed
B
it is temporary
C
it can be cleaned and the original substance recovered
D
it is a slow reaction
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Solution
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A change in which one or more new substances are formed is known as chemical change.
When the iron is exposed to air and moisture, rust formation takes place. Rust is nothing but iron oxide; a new substance formed out of the reaction. The colour of the surface of the iron also changes. Hence, rusting of iron is a chemical change.

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Q1
Which of the following is not a feature of chemical change?
(I) Original substance can be obtained by simple physical methods.
(II) It is a temporary change.
(III) The new substances formed have properties different from those of the reacting substances.

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Q2
Sate which of the following pertains to- chemical changes.
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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.
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Q3
Rusting of iron is a chemical change because _________ .
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