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प्रश्न
Dissolving salt in water is a reversible change.
उत्तर
Dissolving salt in water is a reversible change because salt and water can be again obtained by distillation process.
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संबंधित प्रश्न
Convert the following temperature to Celsius scale:
573 K
Give two reasons to justify water at room temperature is a liquid.
Why is ice at 273 K more effective in cooling than water at the same temperature?
What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state.
The boiling point of alcohol is 78° C. What is this temperature on Kelvin scale ?
Give the usual name for the following :
Heat required to change the state of a substance without changing the temperature.
Explain why, ice at 0° C is more effective in cooling than water at the same temperature.
Define the following term Boiling.
Define the following terms: Vaporisation
Give reasons:
Why a solid does not flow, but a liquid flows?
Give two examples of the following:
Substances which sublime.
State which of the following statement is true or false. If false write the correct statement.
Solids are highly compressible and rigid.
State which of the following statement is true or false. If false write the correct statement.
Atoms/molecules in gases move only about their own positions.
In the paragraph below, write ‘solid’, ‘liquid’ or ‘gas’ in each of the brackets depending on the substance referred to just before.
On a bright sunny day, Riya and Gargi are playing with a ball ( ) in the park. Gargi feels thirsty. So, Riya brings tender coconut water ( ) for her. At the same time, a strong breeze ( ) starts blowing and it also begins to rain ( ). They run back into the house ( ), change their clothes ( ), and then their mother gives them a cup ( ) of hot milk ( ) to drink.
State whether the following statement is true or false. If false write the correct statement.
During physical changes, the composition of the original substance is not altered, but the properties of the original substance are altered.
Fill in the blank with the correct word of the statement given below:
Sublimation is _______ a change of state of matter.
Fill in the blanks with the correct words of the statement given below:
During sublimation, a solid on heating turns directly into _________ and on cooling back to __________.
Give the reason for the following:
The kinetic energy of molecules of gases is very large & of solids, the least.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
During liquefaction, the particles ________ energy.
