Advertisements
Advertisements
प्रश्न
What is the scientific name of particles which make up mater?
उत्तर
Atoms or molecules are the scientific names of particles that make up matter.
APPEARS IN
संबंधित प्रश्न
Name the terms for the change of a solid into liquid.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
What is meant by saying that metals are lustrous ?
What are the two types of pure substances? Give one example of each type.
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
What is meant by a solution ? Give two examples of solutions.
Which of the following can be called a suspension ?
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
How is cream separated from milk ?
The boiling point of liquid argon is :
Which one of the following scrap metal cannot be separated by magnetic separation ?
What type of matter glass is?
Intermolecular space is maximum in ______.
