In which type of change a new substance is formed?

• In physical change

• In chemical change

• In both (a) and (b)

• In neither of these

Which among the following is a physical change?

• Cutting a log of wood in small pieces

• Burning of wood

• Ripening of fruit

• Cooking of food

Galvanisation is a process used to prevent the rusting of which of the following?

• Iron

• Zinc

• Aluminium

• Copper

Which Of The Following Are True When Milk Changes Into Curd?

• Its state is changed from liquid to semi-solid.

• It changes colour and it changes taste.

• Its state is changed from liquid to semi-solid and it changes taste and the change cannot be reversed.

• Its state is changed from liquid to semi-solid and it changes colour and it changes taste and the change cannot be reversed.

Paheli’s Mother Made A Concentrated Sugar Syrup By Dissolving Sugar In Hot Water. On Cooling, Crystal Of Sugar Got Separated. This Indicates A:

• Physical change that can be reversed

• Chemical change that can be reversed

• Physical change that cannot be reversed

• Chemical change that cannot be reversed

In Which Of The Following Sentences Are Incorrect?

• Photosynthesis is a chemical change.

• Digestion of food is a chemical change.

• Formation of manure from leaves is a chemical change.

• Iron and rust are the same substances.

Iron(Fe)+Oxygen(O₂ From the air)+Water(H₂O)+Rust(Iron oxide ______________)

• Fo_{2 ,O3}

• Fe_2,O3

• O3,FE₂

• FE_1,O3

The process of depositing a layer of zinc on iron is called

• Crystallization

• Rusting

• Neutralization

• Galvanization​

Which of the following is a chemical change?

• Twinkling of stars

• Cooking of vegetables

• Cutting of fruits

• Boiling of water

For rusting the presence of both ________ and ________

• Carbon dioxide and oxygen

• Oxygen and water

• hydrogen and oxygen

• water and Carbon dioxide