Advertisements
Advertisements
प्रश्न
Name two solid, two liquid and two gaseous elements at the room temperature.
Advertisements
उत्तर
Aluminium and copper are two elements that are solid at room temperature. Both bromine and mercury are liquid at room temperature. Nitrogen and hydrogen are two elements that are gaseous at room temperature.
APPEARS IN
संबंधित प्रश्न
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Describe in your own words, what happens to the particles when salt dissolves in water.
Honey is more viscous than water. Can you suggest why?
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
How would you confirm that a colourless liquid given to your is pure water ?
State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Define the emulsion. Give one example.
How is the impurity of iron present in several substances removed in industries ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Wipe the board with a duster and then tap the duster against the table. What do you see?
Diffentiate between absorption and adsorption.
All the matter made of ______.
A standard sheet of paper is about ______ of atoms thick
Give an example of liquid in gas.
Define the term matter.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
