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प्रश्न
The minerals from which the metal can be separated economically are called _______.
विकल्प
minerals
ores
gangue
alloy
उत्तर
The minerals from which the metal can be separated economically are called ores.
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संबंधित प्रश्न
Give reasons for the following.
Copper cannot displace zinc from its salt solution.
State one use of Aluminium.
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
State two important uses of following metals:
Uses of iron
State two important uses of following metal
Uses of aluminium
Write name.
Molecular formula of the common ore of aluminium.
Match the alloys given in column I to the uses given in column II :
| Column I | Column II |
| (i) Duralumin | A. Electrical fuse |
| (ii) Solder | B. Surgical instruments |
| (iii) Brass | C. Aircraft body |
| (iv) Stainless Steel | D. Decorative articles |
Give reasons for the following:
Most metals conduct electricity well.
Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.
Name the following:
A metal used in packaging.
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Higher Order Thinking Skills.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.
- Formulate a hypothesis based on the information provided.
- Briefly state how you would test the hypothesis.
What is ductility?
The most abundant metal in the earth’s crust is ____________.
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Which one of the following metals do not react with cold as well as hot water?
Metals are usually solids or gases at room temperature.
Metals are ______ conductors of heat and electricity.
All gases are ______.
Why are metalloids called semimetals?
