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प्रश्न
Explain why:
Lakes and rivers do not suddenly freeze in the winters.
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उत्तर
Lakes and rivers do not freeze suddenly in winters because of the high specific latent heat of solidification, i.e. the amount of heat released when 1 g of water solidifies to form 1 g of ice at 0°C. It is about 336 J/g or 80 cal/g.
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संबंधित प्रश्न
Give two example of Solvent other than water.
Discuss the importance of water as a solvent for our body .
'Water is the universal solvent'. Comment.
How is air dissolved in water different from ordinary air?
State the term: (Do not give examples)
A solution where solvent is a liquid other than water.
In which of the following substances will there be
No change in mass when they are exposed to air?
Sodium chloride
Iron
Conc. sulphuric acid
Table salt
Sodium carbonate crystals
State why ‘Water is considered a universal solvent’. Give the reason for the same.
Explain the importance of dissolved salts in water.
Take two pots with similar plants. Water one of the plants with tap water and the other with seawater. Record your findings and note the difference observed.
Paheli was feeling thirsty but there was only a pot of water at home which was muddy and unfit for drinking. How do you think Paheli would have made this water fit for drinking if the following materials were available to her.
| Alum | tub | muslin cloth | gas stove | thread | pan and lid |
