Advertisements
Advertisements
प्रश्न
State whether colloidal solutions are homogeneous or heterogeneous.
उत्तर
Colloids are heterogeneous mixtures. The size of the particles in the colloids is bigger than the size of particles in the true solutions.
APPEARS IN
संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Fill in the blank :
The substances which can flow are called ________
Give one difference between atoms and molecules.
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
Name one element, one compound and one mixture.
The three important metalloids are.............................. and ..........................
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
Name a metal which has a low melting point.
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Define solubility of a substance. How does it vary with temperature ?
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Name the process by which common salt is obtained from sea-water.
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 will you separate a mixture of common salt, sulphur powder and sand ?
The dyes present in fountain pen ink can be separated by the technique of :
Name the metals that are used in jewellery.
Define the term matter.
