Advertisements
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Write a balanced chemical equation for the reaction of zinc with potassium hydroxide solution.
Give the name and formulae of two basic oxides.
Name two metals which react violently with cold water. Write any three observations you would make when such a metal is dropped into water.
Which of the following are amphoteric oxides:
MgO, ZnO, P2O3, Al2O3, NO2
What is the nature of the oxide SO2? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
State five uses of non-metals.
What are metalloids: Give examples.
Explain the term Minerals.
In which of the following industries, microbial enzymes are not used?
a) Glass industry.
b) Cheese industry
c) Tanning industry.
d) Paper industry.
Select the appropriate option for the following statement:
The element which is a noble metal.
