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प्रश्न
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
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उत्तर
An element is made up of only one kind of atoms.
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संबंधित प्रश्न
A kind of matter which can sublime is
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
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
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
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 ?
Name the process by which common salt is purified.
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
How will you separate a mixture containing sand and sugar ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
What is chromatography ? State its two applications.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
Diffentiate between absorption and adsorption.
The most reactive metal is ______.
The physical state of water at 373 K is ______.
Define the term matter.
Define the term matter.
