Advertisements
Advertisements
प्रश्न
Give two uses of Germanium
Advertisements
उत्तर
- Germanium is used as a semiconductor.
- It is used as a transistor in many electronic applications when mixed with arsenic, gallium, antiomony, etc.
- Germanium is also used to form alloys and as a phosphor in fluorescent lamps
APPEARS IN
संबंधित प्रश्न
Fill in the blanks:
Metals react with acids to produce _________ gas.
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Copper displaces zinc from zinc sulphate solution. ( )
Which property of graphite is utilised in making electrodes?
How are the properties of an alloy different from those of the constitutent elements?
Give reasons
Magnesium is used in fire works.
Fill in the blank
A metal that gives dazzling effect to crackers when they explode is ______
State two important uses of following metal.
Uses of copper
State two important uses of following metal
Uses of tin
State the position of the following in the periodic table:
Alkaline earth metals
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
Write name.
The oxide that forms salt and water by reacting with both acid and base.
State the position of the following in the periodic table:
Halogens
What is it made from? Why?
A pair of tongs.
Aluminium: _______: gold : : electric insulator
Can you store pickle in an aluminium utensil? Give reason.
The most abundant element in the universe is ____________.
Which of the following two combinations are correct?
| Metal | Gas Evolved | |
| (i) | Copper | Yes |
| (ii) | Iron | Yes |
| (iii) | Magnesium | No |
| (iv) | Zinc | Yes |
Which of the following property is generally not shown by metals?
Metals have high melting points.
Match the following
| i. | Silica | a. | Caustic potash |
| ii. | Potassium hydroxide | b. | Sand |
| iii. | Sodium hydroxide | c. | Calamine |
| iv. | Zinc carbonate | d. | Caustic soda |
