PHYSICAL AND CHEMICAL CHANGES MCQ
11/7/20244 min read
What is a physical change?
a) A change that results in new substances
b) A change in the physical properties of a substance
c) A change that is always irreversible
d) A change that alters the chemical properties of a substance
Answer: b) A change in the physical properties of a substance
Which of the following represents a physical change?
a) Rusting of iron
b) Burning of wood
c) Melting of ice
d) Souring of milk
Answer: c) Melting of ice
What defines a chemical change?
a) A change where the shape and size of a substance change
b) A change that results in the formation of one or more new substances
c) A reversible change
d) A change that does not produce new substances
Answer: b) A change that results in the formation of one or more new substances
Which of the following is an example of a chemical change?
a) Cutting a piece of paper
b) Dissolving sugar in water
c) Burning magnesium ribbon
d) Melting wax
Answer: c) Burning magnesium ribbon
What happens during the rusting of iron?
a) Iron turns into water
b) Iron forms iron oxide
c) Iron turns into iron sulfide
d) Iron remains unchanged
Answer: b) Iron forms iron oxide
What type of change occurs when a sugar solution is formed?
a) Chemical change
b) Physical change
c) Irreversible change
d) Permanent change
Answer: b) Physical change
Which of the following changes is typically reversible?
a) Chemical change
b) Physical change
c) Both a and b
d) Neither a nor b
Answer: b) Physical change
What occurs when vinegar reacts with baking soda?
a) Formation of water
b) Formation of carbon dioxide
c) Formation of hydrogen gas
d) Formation of oxygen gas
Answer: b) Formation of carbon dioxide
Which of the following is NOT considered a sign of a chemical change?
a) Formation of a new substance
b) Change in color
c) Change in state
d) Production of gas
Answer: c) Change in state
How can rusting of iron be prevented?
a) By keeping iron in the sun
b) By painting or coating it with grease
c) By washing it with water
d) By heating the iron
Answer: b) By painting or coating it with grease
What is the term for the process of coating iron with zinc?
a) Painting
b) Greasing
c) Galvanization
d) Rusting
Answer: c) Galvanization
What type of change is the boiling of water?
a) Physical change
b) Chemical change
c) Irreversible change
d) None of the above
Answer: a) Physical change
Which property remains unchanged during a physical change?
a) Shape
b) Size
c) State
d) Chemical composition
Answer: d) Chemical composition
What happens when a piece of paper is burned?
a) Physical change
b) Chemical change
c) Temporary change
d) Reversible change
Answer: b) Chemical change
What changes occur when a candle burns?
a) Only physical changes
b) Only chemical changes
c) Both physical and chemical changes
d) No changes
Answer: c) Both physical and chemical changes
What happens when magnesium ribbon burns?
a) It forms a new substance called magnesium oxide
b) It turns into water
c) It evaporates without leaving any residue
d) It remains unchanged
Answer: a) It forms a new substance called magnesium oxide
What type of change occurs when milk turns into curd?
a) Physical change
b) Chemical change
c) Reversible change
d) None of the above
Answer: b) Chemical change
Which of the following is considered a physical property?
a) Color
b) Reactivity
c) Flammability
d) Toxicity
Answer: a) Color
Which change results in the formation of a precipitate?
a) Dissolving salt in water
b) Mixing vinegar and baking soda
c) Mixing sodium sulfate and barium chloride
d) Melting of ice
Answer: c) Mixing sodium sulfate and barium chloride
What occurs when copper sulfate reacts with iron?
a) Iron sulfate and copper are formed
b) No reaction occurs
c) Iron reacts with sulfur
d) Copper sulfate remains unchanged
Answer: a) Iron sulfate and copper are formed
What type of change occurs when a log of wood is cut into pieces?
a) Physical change
b) Chemical change
c) Both a and b
d) Neither a nor b
Answer: a) Physical change
What happens when carbon dioxide is passed through lime water?
a) Lime water turns clear
b) Lime water turns milky
c) No change occurs
d) Lime water evaporates
Answer: b) Lime water turns milky
What is the chemical name of baking soda?
a) Sodium chloride
b) Sodium bicarbonate
c) Sodium carbonate
d) Sodium hydroxide
Answer: b) Sodium bicarbonate
Which process is used to obtain large crystals of a pure substance from its solution?
a) Evaporation
b) Crystallization
c) Distillation
d) Filtration
Answer: b) Crystallization
What is formed when magnesium oxide reacts with water?
a) Magnesium hydroxide
b) Magnesium carbonate
c) Magnesium sulfate
d) Magnesium chloride
Answer: a) Magnesium hydroxide
What effect does heating a metal blade have?
a) It changes color
b) It melts
c) It evaporates
d) It turns into ash
Answer: a) It changes color
What type of change is the souring of milk?
a) Physical change
b) Chemical change
c) Reversible change
d) None of the above
Answer: b) Chemical change
What happens to iron in the presence of both moisture and oxygen?
a) It melts
b) It rusts
c) It becomes shiny
d) It breaks
Answer: b) It rusts
Which method can be used to prevent rusting?
a) Keeping iron in the sun
b) Applying a coat of grease
c) Washing it with water
d) Heating the iron
Answer: b) Applying a coat of grease
What type of change occurs during the explosion of a firework?
a) Physical change
b) Chemical change
c) Reversible change
d) None of the above
Answer: b) Chemical change