Advertisements
Advertisements
प्रश्न
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
Advertisements
उत्तर
We will dissolve sodium chloride or NaCl in water in room temperature, till the water can no longer dissolve any more salt. By doing so, we will obtain a saturated solution of sodium chloride.
If the temperature is lowered from 25°C to 10°C, some of its dissolved solutes will get separated in the form of solute crystals due to the decrease in solubility of the solute.
APPEARS IN
संबंधित प्रश्न
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
Give one difference between atoms and molecules.
Define matter. Give four examples of matter.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Which of the following is not an element ?
Which of the following are compounds ?
- CO
- No
- NO
- Co
The property/properties which enable copper metal to be used for making electric wires is/are :
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
Out of a colloid, solution and a suspension :
which one has the largest particles ?
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
Give some examples of the Tyndall effect observed in your surroundings?
Gases change to liquid by the process of ______.
Solids do not flow.
Evaporation does form bubbles.
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
______ is used for industrial refrigeration and transporting frozen food.
