Foundation Level II JEE Mock Test-5 (Chemistry)

A change in which we get back the initial substance by reversing the action is an __________ change.

• Reversible change

• Irreversible change

• Chemical change

• None of these

Photosynthesis is a example of ___________ change.

• Physical change

• Chemical change

• Reversible change

• None of these

Physical changes are generally ________

• Reversible

• Irreversible

• Both reversible and irreversible

• None of these

  In which type of change a new substance is formed?

• In physical change

• In chemical change

• Physical and Chemical change

• None 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

Which is a method to prevent rust?

• Crystallization

• Sedimentation

• Galvanisation

• None of these

How crystal of pure substances are obtained?

• By crystallization

• By chromatography

• By sedimentation

• By all these methods

What is the formula of rust?

• Fe2O3

• Fe3O4

• FeO

• None of these

When carbon dioxide is passed through lime water, it turns milky due to the formation of________

• Calcium hydroxide

• Calcium carbonate

• Calcium oxide

• None of these

 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 metres high

• It weighs about 6000 kg

• It was built more than 1600 years ago

• It has not rusted after such a long period