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प्रश्न
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
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उत्तर
Immiscible liquids are separated by using a separating funnel.
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संबंधित प्रश्न
Solids have definite shape and definite volume.
Name the terms for the particles of matter which may or may not have independent existence.
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
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
What is the other name for impure substances ? Give two examples of impure substances.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
How would you confirm that a colourless liquid given to your is pure water ?
Name a metal which has a low melting point.
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
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
Choose the correct answer.
A 5 per cent sugar solution means that :
Which of the following can be called a suspension ?
Which of the following mixture cannot be separated by using water as the solvent ?
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Which among the following ______ will get attracted to by magnet?
Diffentiate between absorption and adsorption.
Intermolecular space is maximum in ______.
Evaporation does form bubbles.
Define the term matter.
