Physical And Chemical Changes

Chemistry
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Conditions necessary for rusting iron are

A
exposed surface of iron
B
moisture
C
air
D
presence of nitrogen
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Rust forms on:

A
tin
B
copper
C
iron
D
lead
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The change which is permanent and can not be measured by just reversing the condition is known as:

A
physical change
B
chemical change
C
Both A and B
D
None of the above
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Which of the following is not a physical change?

A
Tearing a paper
B
Bending an iron rod
C
Freezing water into ice
D
Curdling of milk
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An example of a chemical change is:

A
formation of clouds
B
glowing of an electric light
C
dropping sodium into water
D
dissolving of salt in water
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An example of chemical change is:

A
water condensing on the outside of your cold beverage
B
bending a wire
C
slicing bread
D
freezing water
E
burning a candle
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Which salt is obtained from the evaporation of sea water?

A
Sodium chloride
B
Magnesium chloride
C
Calcium chloride
D
Potassium chloride
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What is a chemical change?

A
Change in size, shape
B
Change from one substance to another new substance
C
Change in temperature of the substance
D
None of above
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