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प्रश्न
What are the observations and conclusions when tap water is boiled and evaporated in watch glass?
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उत्तर
When tap water is boiled and evaporated:
Observations:
- A number of concentric rings of solid matter are seen on the watch glass after evaporation of tap water.
Conclusion:
- Tap water contains dissolved salts, minerals and impurities.
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संबंधित प्रश्न
Give two examples of Drying agent.
In which of the following substances will there be
Increase in mass
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
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Give a reason why water is called a ‘universal solvent’ but, an alkali is not.
Give a reason why boiled water tastes flat.
Give a reason for the following.
Water is a universal solvent.
Explain the importance of dissolved salts in water.
Sheela, Saima and Ravi have to dissolve maximum amount of sugar in the same amount of milk so as to win in a game. Ravi took hot boiling milk while Saima took ice cold milk. Sheela managed to get milk at room temperature. Whom do you think would win the game and why?
State whether the following statement is true or false.
Water can be separated from salt by evaporation.
