Advertisements
Advertisements
प्रश्न
State whether colloidal solutions are homogeneous or heterogeneous.
Advertisements
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
Define the following term of Matter .
Explain why air is used to inflate tyres.
What are pure substances ? Give two examples of pure substances.
How would you confirm that a colourless liquid given to your is pure water ?
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
Draw a flow-chart for the schematic representation of different types of matter.
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
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 ?
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
Name the process which can be used to recover salt from an aqueous salt solution.
How will you separate a mixture of iron filings, chalk powder and common salt ?
The dyes present in fountain pen ink can be separated by the technique of :
One of the following does not undergo sublimation. This one is :
What's the solution?
We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
The most reactive metal is ______.
Define the term matter.
