Advertisements
Advertisements
प्रश्न
The elements which normally exist in the liquid state are :
पर्याय
bromine and iodine
mercury and chlorine
iodine and mercury
bromine and mercury
Advertisements
उत्तर
bromine and iodine
Mercury is a metal that exists in liquid state and bromine is a non-metal that exists in liquid state.
APPEARS IN
संबंधित प्रश्न
What are the two conditions for the interconversion of states of matter ?
What are the conditions for 'something' to be called 'matter'?
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Name a non-metal which is a good conductor of electricity.
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
What are pure substances ? Give two examples of pure substances.
What is the other name for impure substances ? Give two examples of impure substances.
Name a metal which can be easily cut with a knife.
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
Which of the following does not have a fixed melting point/boiling point ?
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
Choose the correct answer.
A 5 per cent sugar solution means that :
In what respects does a true solution differ from a colloidal solution ?
How will you separate iron pins from sand ?
Explain how, nitrogen , oxygen and argon gases are separated from air.
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
Gases change to liquid by the process of ______.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
