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प्रश्न
Salt can be separated from its solution (salt dissolved in water), because
पर्याय
mixing of salt in water is a change that can be reversed by heating and melting of salt
mixing of salt in water is a change that cannot be reversed
mixing of salt in water is a permanent change
mixing of salt in water is a change that can be reversed by evaporation.
उत्तर
mixing of salt in water is a change that can be reversed by evaporation.
Explanation -
Salt can be separated from its water solution by evaporating the water. Hence mixing of salt in water is a reversible change.
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संबंधित प्रश्न
Differentiate reversible and irreversible changes.
Periodical removal of one of the products of a reversible reaction increases the yield.
Evaporation of water is a reversible change.
Pick the change that can be reversed from the following.
While lighting a candle, Paheli observed the following changes.
- Wax was melting
- Candle was burning
- Size of the candle was reducing
- Melted wax was getting solidified. of the above, the changes that can be reversed are
Which of the following changes cannot be reversed?
- Blowing of a balloon
- Folding paper to make a toy aeroplane
- Rolling a ball of dough to make roti
- Baking cake in an oven
- Drying a wet cloth
- Making biogas from cow dung
- Burning of a candle
Paheli mixed flour and water and
- made a dough,
- rolled the dough to make a chapati,
- baked the chapati on a pan,
- dried the chapati and ground it in a grinder to make powder.
Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.
Circle the odd one out. Give a reason for your choice.
Choose the odd one out. Give a reason for your choice.
Choose the odd one out. Give reason for your choice.
