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प्रश्न
Give reasons
Graphite is used in the leads of pencils
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उत्तर
Graphite turns paper black that is why it is used in the leads of pencils.
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संबंधित प्रश्न
State one use of Gold.
The atomic number of an element Y is 16.
(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?
(b) Which inert gas is nearest to Y?
Which of the following alloys contains mercury as one of the constituents?
(a) stainless steel
(b) solder
(c) duralumin
(d) zinc amalgam
Mention two uses of the following metals and non-metals
Aluminium
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
______ is a liquid metal.
State the position of the following in the periodic table:
Alkali metals
The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.
What was Mendeleev's basis for the classification of elements?
What is it made from? Why?
A pair of tongs.
Name the following:
A halogen which is a solid at room temperature.
The minerals from which the metal can be separated economically are called _______.
Soft metal : Na : : hard metal : _______
Write the name.
Two highly reactive metals-
The metal which is liquid at room temperature is ______.
Give an example of a metal which
- is liquid at room temperature.
- is the best conductor of heat.
Name two soft metals which can be cut with a knife.
Silver and copper are very good conductors of electricity.
Why do metals appear shiny?
Which metals are not solid at room temperature?
