1 A chemical change is also called a: A Chemical reaction B Physical reaction C Reversible reaction D Slow reaction
2 Which of the following is a characteristic of a chemical change? A New substances are formed B No new substances are formed C The change is reversible D Only physical state changes
3 The burning of LPG in a gas stove is a: A Chemical change B Physical change C Reversible change D Temporary change
4 The formation of a precipitate is an indication of: A Chemical change B Physical change C Reversible change D Fast change
5 Which of the following is a chemical change? A Cooking of food B Cutting of hair C Mixing of sand and water D Folding of paper
7 The chemical change that takes place when iron is exposed to moist air is: A Corrosion B Combustion C Fermentation D Decomposition
8 The decomposition of organic matter is a: A Chemical change B Physical change C Reversible change D Temporary change
9 The process in which a substance loses oxygen is called: A Reduction B Oxidation C Combustion D Fermentation
10 The reaction between iron and copper sulfate solution is a: A Chemical change B Physical change C Reversible change D Fast change
11 Burning of wood is an example of: A Chemical change B Physical change C Reversible change D Temporary change
12 Which of the following is a chemical change? A Rusting of iron B Cutting of paper C Boiling of water D Breaking of glass
13 Making of a clay pot is a: A Physical change B Chemical change C Both physical and chemical D Irreversible change
15 Which of the following is a physical change? A Cutting of cloth B Burning of cloth C Rusting of iron D Souring of milk
16 A piece of paper cut into small pieces is a: A Physical change B Chemical change C Permanent change D Irreversible change
17 Formation of curd from milk is a: A Chemical change B Physical change C Reversible change D Fast change
18 The process of changing a solid directly to gas is called: A Sublimation B Evaporation C Condensation D Melting
19 Which of these is an example of a physical change? A Boiling water to steam B Baking bread C Burning paper D Ripening of fruit
20 Formation of clouds is a: A Physical change B Chemical change C Permanent change D Irreversible change
21 Which of the following changes is permanent? A Burning of wood B Melting of ice C Boiling of water D Stretching of rubber
22 Burning of candle involves: A Both physical and chemical changes B Only physical change C Only chemical change D No change
23 Which of the following is a chemical change? A Photosynthesis B Evaporation C Condensation D Sublimation
24 The gas produced during the reaction between baking soda and vinegar is: A Carbon dioxide B Oxygen C Hydrogen D Nitrogen