MEDIUM
7th CBSE
IMPORTANT
Earn 100

The necessary condition for rusting is
(a)presence of carbon dioxide
(b)presence of hydrogen
(c)presence of air and water
(d)presence of nitrogen

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Important Questions on Changes of Matter
MEDIUM
7th CBSE
IMPORTANT

EASY
7th CBSE
IMPORTANT

MEDIUM
7th CBSE
IMPORTANT

MEDIUM
7th CBSE
IMPORTANT

MEDIUM
7th CBSE
IMPORTANT

MEDIUM
7th CBSE
IMPORTANT
Match the following to show changes. Identify each as a physical or chemical change.
Column A | Column B |
a)decomposition of | i)a magnesium ribbon |
b)cutting a | ii)old leaves |
c)blowing of | iii)rubber band |
d)stretching of a | iv)balloons |
e)souring of | v)copper wire |
f)burning of | vi)milk |

EASY
7th CBSE
IMPORTANT

MEDIUM
7th CBSE
IMPORTANT
