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प्रश्न
Tick the most appropriate answer.
Melting of ice is a
विकल्प
reversible change
irreversible change
chemical change
none of these
उत्तर
reversible change,
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संबंधित प्रश्न
What is the physical state of water at 100°C.
For any substance, why does the temperature remain constant during the change of state?
Give two reasons to justify an iron almirah is a solid at room temperature.
Name A, B, C, D, E and F in the following diagram showing change in its state.
Is there any change in temperature during the change of phase?
Give the usual name for the following :
Heat required to change the state of a substance without changing the temperature.
What is the name of the process in which a gas turns directly into a solid ?
Draw a labelled diagram of the experimental set-up to study the latent heat of vaporisation of water.
What is sublimation ? Name two substances (other than ammonium chloride) which undergo sublimation.
Draw a labelled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.
Define the following terms: Melting point
Why does a candle become smaller on burning with time?
Name the phenomenon which causes the following changes:
Formation of water vapour from water
A substance which can change its state
Explain the term freezing
With the help of a simple diagram how would you show that – solids expand on heating
State the property of the following substance.
Lead chloride reacts with barium sulphate to give a white precipitate of lead sulphate.
State if the following is a physical property of a substance.
Water acidified with dilute sulphuric acid is a good conductor of electricity.
What will happen if....? And why?
A bell is made of wood.
Why does this happen?
Kerosene left open in a dish disappears.
