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प्रश्न
Mention two uses of the following metals and non-metals
Oxygen
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उत्तर
It is used by all living beings for breathing.
It is important for combustion.
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संबंधित प्रश्न
Give reasons for the following.
Copper cannot displace zinc from its salt solution.
Give a reason for the following:
Alkali metals are good reducing agents.
State one use of the following metal:
Silver
Statements given below are incorrect. Write the correct statements :
Zinc is used for making power transmission wires.
State two important uses of following metal
Uses of mercury
Give the general characteristics of:
Alkaline earth metals with reference to
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Write name.
The nonmetal having electrical conductivity.
Write scientific reason.
Generally the ionic compounds have high melting points.
State the position of the following in the periodic table:
Halogens
What is it made from? Why?
A pair of tongs.
What is it made from? Why?
Electric cables
Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.
When a copper coin is dipped in the solution of silver nitrate, it shows a lustre on its surface. Explain this process with the help of a chemical equation.
______ is the first scientist who used the term element.
Give an example of a metal which
- is liquid at room temperature.
- is the best conductor of heat.
Which of the following is not a metal?
The metal can be cut with a knife ______.
Silver and copper are very good conductors of electricity.
The metals which are found in both free state as well as combined state are ______.
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
______ is the metallic element.
