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प्रश्न
You are given a dry cell, a torch bulb with holder, wires and crocodile clips. How would you use them to distinguish between samples of metals and non-metals?
उत्तर
Take a torch bulb fitted with a holder and connect it to a dry cell using connecting wires, as shown in the figure below. There is a gap between the ends of the crocodile clips A and B; so, no current flows in the incomplete circuit. Hence, the bulb does not light up.
Metals are good conductors of electricity. Hence, if samples of metals are inserted between the clips A and B, the sample will allow an electric current to pass through it and the bulb will light up. But non-metals do not conduct electricity. Hence, the samples of non-metals do not allow any electric current to pass through them and the bulb will not glow.
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संबंधित प्रश्न
Choose the most appropriate answer of the following:
This is not an alloy of copper:
(A) Brass
(B) Bronze
(C) Solder
(D) Duralumin.
How do non-metals react with oxygen? Explain with an example. Give equation of the reaction involved. What is the nature of the product formed? How will you demonstrate it?
Tick (√) the most appropriate answer.
Sodium amalgam is prepared by dissolving sodium in :
Name a metal which is lighter than water :
`Na _____ → Na^+`
Complete the table.
| Property of metal | Use in everyday life |
| i. Ductility | |
| ii. Malleability | |
| iii. Conduction of heat | |
| iv. Conduction of electricity | |
| v. Sonority |
With reference to the physical properties of metals and non-metals, state the following exception.
a non-metal which sublimes and is non-lustrous
Find the odd one out and give its explanation.
Give two examples of alloy.
Reason out
Mercury is the only metal that is liquid at room temperature.
