Burning of magnesium ribbon is a .................. - Chemical change
Boiling of egg is ............... - Chemical change
Boiling of water is ............. - physical change
physical change is ..... .........change - Reversible
Food items are kept carefully but spoiled is. a .................. - Chemical change
Condensation of steam is a ............. - physical change
Beating the aluminium into foil is. a ...................... - physical change
When baking soda is mixed with lemon juice a bubble is formed and evolution of CO2 gas is a .................. - Chemical change
In which type of change a new substance is formed - Chemical change
Which among the following is a physical change? - Cutting a log of wood in small pieces
Which is a method to prevent rust? - Galvanisation
What is the chemical formula of rust - Fe2O3
What will happen if carbon dioxide gas is passed through lime water ? - Both
Galvanisation is a process used to prevent the rusting of which of the following? - zinc
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 has not rusted after such a long time
Properties like size, shape, colour, state of a substance are - Physical properties
Rusting occurs when iron is exposed to - oxygen and water
The process of depositing a layer of zinc over iron is known as - Galvanisation
When a new substance is formed with different properties than those of the original substance, it is called a - Chemical change
Which characteristic best describes a physical change? - Composition stays the same
Ships suffer a lot of damage from rusting inspite of being painted because: - sea water contains many salts
When you leave a piece of iron in the open for some time, it acquires a film of brownish substance. The substance is called: - Rust
