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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
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Sodium is a very reactive metal. ( )
Give a reason for Alkali metals are good reducing agents.
How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
State two important uses of following metal:
Uses of gold
State two important uses of following metal.
Uses of copper
State the position of the following in the periodic table:
Alkaline earth metals
Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Write name of any element present in the same group as X
What is it made from? Why?
Electric cables
Give a reason why a green deposit is seen on the surface of an article of copper
Complete the following flow chart.
Name two soft metals which can be cut with a knife.
Why are bells made of metals?
Sodium is a hard metal.
Metals have high melting points.
Match the following
| i. | Softest metal | a. | Copper |
| ii. | Hardest metal | b. | Sodium |
| iii. | Hardest non–metal | c. | Osmium |
| iv. | Ductility | d. | Diamond |
Why do metals appear shiny?
