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प्रश्न
Write name.
The device used for grinding an ore.
उत्तर
The device used for grinding an ore- Ball mill
संबंधित प्रश्न
What happens when Dilute sulphuric acid is poured on a copper plate?
Write word equations of the reactions involved.
Fill in the following blank with suitable word:
Brass is an alloy of copper and .........
Fill in the following blank with suitable word:
The alloy in which one of the metals is mercury is called an ...............
What is an alloy? How is an alloy made?
A metal which is neither ductile nor malleable is
Write ‘True’ or ‘False’ in front of following statement.
Brass is an alloy of copper and zinc and has lustrous yellow colour.
State the position of the following in the periodic table:
Aluminium
Why is hydrogen placed with alkali metals?
What is it made from? Why?
Ornaments
What is it made from? Why?
Pots and pans
Give a reason why a green deposit is seen on the surface of an article of copper
Name the following:
The most reactive halogen.
Aluminium: _______: gold : : electric insulator
Write scientific reason.
Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish.
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
- Na
- Ca
- Fe
- Cu
______ is the first scientist who used the term element.
Name two soft metals which can be cut with a knife.
All gases are ______.
Silver and copper are very good conductors of electricity.
Which metals are liquid at room temperature?
