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प्रश्न
What is an amalgam? How does an amalgam different from an alloy?
उत्तर
An amalgam is a homogeneous mixture of a metal in mercury whereas an alloy is a homogeneous mixture of two or more molten metals (or a non-metal) generally made for improving one or more properties of metals.
Example: When sodium dissolves in mercury, it forms sodium amalgam.
When zinc and copper are combined, alloy named brass is formed.
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संबंधित प्रश्न
Write any three differences between metals and non-metals with respect to their physical properties.
Give an example of a metal which is a poor conductor of heat.
Which property of copper and aluminium makes them suitable for making cooking utensils and boilers?
State one use of Hydrogen.
Which of the following non-metal is a liquid?
(a) carbon
(b) sulphur
(c) bromine
(d) iodine
Name a metal that is brittle
Name a non-metal that is liquid at room temperature
Give reasons
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`Fe_2O_3, , NO, PbO, Mn_2O_7`
Acidic oxide ………………
Give a short account of heating effect on metal carbonates based on the activity series ?
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Identify the odd term.
What are the metals that make the alloys brass and bronze?
Three experiments to study the process of rusting are given below. Observe the three test tubes and answer the following questions.
- Why the nail in the test tube 2 is not rusted?
- Why is the nail in the test tube 1 is rusted highly?
- Would the nail in the test tube 3 get rusted?
Complete the statement given below, by filling in the blank with the correct word:
A non-metal added to swimming pools to kill germs_____.
The sound of one metal colliding with another makes a noise, this property is called as _______.
Which non-metal is essential for our life and all living beings?
Match the following:
| 1. | Non-metals | a. | Silicon |
| 2. | Metals | b. | fire extinguisher |
| 3. | Metalloids | c. | dull and soft |
| 4. | Oxygen | d. | hard and shiny |
| 5. | Water | e. | supports fire |
Non – metals are ______.
