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प्रश्न
Name the three classes in which elements are classified. Which was the first metal used by man?
उत्तर
- Elements are classified as metals, non-metals and metalloids.
- The first metal that man used was copper.
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संबंधित प्रश्न
Choose the correct answer from the options given below :
The two main metals in Bronze are:
(A) Copper and zinc
(B) Copper and lead
(C) Copper and nickel
(D) Copper and tin
"Is malleable and ductile". This best describes:
(a) a metal
(b) a compound
(c) a non-metal
(d) a solution
State two important uses of following non-metal
Uses of graphite
What is an amalgam? How does an amalgam different from an alloy?
Name:
a metal with low melting and boiling points
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Neutral oxide ……………..
Name a non-metal which shows reducing property.
Give reason for the following:
Metals form cations while non-metals form anions.
Non-metals are non-malleable.
Non-metals are usually good conductors of heat and electricity.
