CBSE Questions for Class 7 Chemistry Physical And Chemical Changes Quiz 1 - MCQExams.com

An example of a chemical change is:
  • formation of clouds
  • glowing of an electric light
  • dropping sodium into water
  • dissolving of salt in water
Physical changes like boiling do not make new materials and are easily reversed e.g. by cooling, which causes ________.
  • condensation
  • reactants
  • reaction
  • colour
Combustion is a ________________.
  • physical change
  • chemical change
  • Both A and B
  • None of these
Which salt is obtained from the evaporation of sea water?
  • Sodium chloride
  • Magnesium chloride
  • Calcium chloride
  • Potassium chloride
Which of the following is not true for a chemical change?
  • New substances are formed
  • They are irreversible
  • Chemical properties of new substance are same
  • Chemical properties of new substance are different
Physical changes are ________.
  • Temporary
  • Permanent
  • Irreversible
  • Endothermic
Rust forms on:
  • tin
  • copper
  • iron
  • lead
Weight of crucible + weight of magnesium wire = X (before heating)
Weight of crucible + weight product magnesium oxide = Y (after heating)
Which of the following option is correct?
  • X = Y
  • X < Y
  • X > Y
  • Depends on element
Which of the following is a feature of physical change?
  • It is reversible
  • It is temporary
  • No new substance is formed
  • All of these
The change which is permanent and can not be measured by just reversing the condition is known as:
  • physical change
  • chemical change
  • Both A and B
  • None of the above
An example of chemical change is:
  • water condensing on the outside of your cold beverage
  • bending a wire
  • slicing bread
  • freezing water
  • burning a candle
Which of the following is a chemical change:
  • melting of ice
  • boiling of water
  • rusting of iron
  • tearing a paper
Corrosion is a chemical reaction that involves :
  • The inside of the object changing from an element to a compound
  • The surface of the object changing from an element to a compound
  • Nothing happens
  • The surface of the object changes from one element into another element
Rusting is a special term, given to the corrosion of which metal?
  • Zinc
  • Copper
  • Nickel
  • Iron
What are the characteristics of a chemical change? 
  • Permanent
  • Formation of new substances
  • Absorption or release of heat, light
  • All of above
Example of the physical change is :
  • respiration (inhaling oxygen gas and exhaling carbon dioxide gas)
  • mixing vinegar and baking soda
  • evaporating water
  • burning fuel in your car
Which of the following is not a physical change?
  • Tearing a paper
  • Bending an iron rod
  • Freezing water into ice
  • Curdling of milk
Which of the following is a physical change?
  • burning fuel in your car
  • baking cookies
  • mixing vinegar and baking soda
  • respiration (inhaling oxygen gas and exhaling carbon dioxide gas)
  • evaporating water
A man painted his main gate made up of iron, to 
i) Prevent it from rusting.
ii) Protect it from sun.
iii) Make it look beautiful.
iv) Make it dust-free.

Which of the above statement(s) is/are correct?
  • $$(i)$$ $$and$$ $$(ii)$$
  • $$(ii)$$ $$and$$ $$(iii)$$
  • $$only$$ $$(ii)$$
  • $$(i)$$ $$and$$ $$(iii)$$
Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?
  • It is more than 7 meters high
  • It weights about 6000 kg
  • It was built more than 1600 years ago
  • It has not rusted after such a long period
Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
  • (i), (ii) and (iii)
  • (i), (ii) and (iv)
  • (i), (iii) and (iv)
  • (ii), (iii) and (iv)
Classify the following as physical or chemical properties.
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
  • Chemical
  • Physical
  • Both $$A$$ and $$B$$
  • None of these
Classify the following as physical or chemical change.

Metallic sodium is soft enough to be cut with a knife.
  • Chemical
  • Physical
  • Both $$A$$ and $$B$$
  • None of these
Which of the following are chemical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
  • only (ii)
  • (ii) and (iii)
  • (iii) and (iv)
  • (i) and (iv)
Assertion: Physical change of a substance involves a change in all properties and composition of its molecules.
Reason: The change of a substance with alteration of the composition of its molecules without any change in its specific property is called physical change.

Read the above assertion and reason and choose the correct option from the following.
  • Both assertion and reason are correct and reason is the correct explanation of the assertion.
  • Both assertion and reason are correct, but reason is not the correct explanation of the assertion.
  • Assertion is correct, but reason is incorrect
  • Assertion is incorrect, but reason is correct
  • Both assertion and reason are incorrect
Rain formation is a:
  • chemical change
  • physical change
  • no change takes place
  • gravitational phenomenon
Iron vessels are coated with tin to:
  • give better shining
  • increase the strength
  • increase weight
  • prevent rusting
Conditions necessary for rusting iron are
  • exposed surface of iron
  • moisture
  • air
  • presence of nitrogen
Identify the physical change in the following:
  • Reaction of zinc metal with dilute sulphuric acid.
  • Formation of solutions of soluble substances in water.
  • Burning of coal
  • Photosynthesis
Which of the following is not a physical change?
  • Boiling of water to give water vapour
  • Melting of ice to give water
  • Dissolution of salt in water
  • Burning of Liquefied Petroleum Gas (LPG)
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 7 Chemistry Quiz Questions and Answers