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प्रश्न
What is an alloy? How is an alloy made?
उत्तर
An alloy is a uniform combination of two or more metals or a metal with a non-metal. It is produced by mixing metals in their molten state in desired quantities. The mixture is then cooled at room temperature. Similarly, an alloy of a metal and a non-metal is prepared by dissolving the non-metal in the molten metal. The mixture is then cooled at room temperature
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संबंधित प्रश्न
State five uses of metals
State one use of Aluminium.
Name a metal which is not malleable :
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Hydrochloric acid,
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.
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.
Assertion: Mercury is solid in room temperature.
Reason: Mercury is a non-metal.
Generally, metals are solid in nature. Which one of the following metals is found in a liquid state at room temperature?
The metal can be cut with a knife ______.
Match the following
| i. | Softest metal | a. | Copper |
| ii. | Hardest metal | b. | Sodium |
| iii. | Hardest non–metal | c. | Osmium |
| iv. | Ductility | d. | Diamond |
