Advertisements
Advertisements
प्रश्न
Give a reason why water is called a ‘universal solvent’ but, an alkali is not.
उत्तर
Water is a polar covalent compound. When it comes in contact with any substance it breaks the electrostatic forces holding the molecules of that substance. Thus, the molecules break loose from the substance and hence dissolve in water. Thus, water is called a universal solvent and an alkali is not.
APPEARS IN
संबंधित प्रश्न
Give reason for Table salt becomes moist during rainy season.
Discuss the importance of water as a solvent for our body .
'Water is the universal solvent'. Comment.
What are the observations and conclusions when tap water is boiled and evaporated in watch glass?
Explain why boiled or distilled water tastes flat.
Explain the terms:
Solute
State the term: (Do not give examples)
A solution where solvent is a liquid other than water.
Explain why:
Lakes and rivers do not suddenly freeze in the winters.
Explain why:
The solute cannot be separated from a solution by filtration.
In which of the following substances will there be
Increase in mass
In which of the following substances will there be
Decrease 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
Give a reason why boiled water tastes flat.
Give a reason for the following.
Water is a universal solvent.
What insoluble substance? Give examples.
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 |
