Advertisements
Advertisements
Question
Which of the following cannot be separated from air by the process of fractional distillation ?
Options
oxygen
argon
hydrogen
nitrogen
Advertisements
Solution
hydrogen
Hydrogen cannot be separated from the mixture of air as it is not present in free state. The three major components of air are nitrogen, oxygen and argon. These are separated using fractional distillation.
APPEARS IN
RELATED QUESTIONS
Differentiate between an atom and a molecule.
Fill in the blank :
The state of matter with definite volume and definite shape is called______
What is meant by saying that non-metals are brittle ?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
State two physical properties on the basis of which metals can be distinguished from non-metals.
Which of the following are compounds ?
- CO
- No
- NO
- Co
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
Define Sol and give one example.
Define the emulsion. Give one example.
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
How will you separate iron pins from sand ?
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Which of the following mixture cannot be separated by using water as the solvent ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Solids do not flow.
