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प्रश्न
What is the most common way of expressing the concentration of a solution ?
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उत्तर
Percentage method is the most common way of expressing the concentration of a solution.
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संबंधित प्रश्न
Which one is a kind of matter:
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 the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
What elements do the following compounds contain ?
Sugar, Common salt
Name two solid, two liquid and two gaseous elements at the room temperature.
State whether the following statement is true or false :
Bread is an example of solid foam.
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
What difference in the properties of oil and water enable their separation by a separating funnel ?
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
How will you separate camphor, common salt and iron nails from their mixture ?
Pure copper sulphate can be obtained from an impure sample by the process of :
Which of the following cannot be separated from air by the process of fractional distillation ?
Which one of the following scrap metal cannot be separated by magnetic separation ?
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 ?
Matter is made up of ______.
Liquids cannot be compressed and they have fixed volume.
The physical state of water at 373 K is ______.
Examples of foam are ______.
Define the term matter.
