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.
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down word equations of all the reactions taking place in this process.
What is an alloy?
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
Salt of silver, such as ________ is used for making photographic films.
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
State two important uses of following metal
Uses of magnesium
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Sulphuric acid
Write name.
The device used for grinding an ore.
Write scientific reason.
Generally the ionic compounds have high melting points.
Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Write name of any element present in the same group as X
With reference to the following metals state their use in daily life metal:
iron
Name the following:
A metal used in flexible pipes.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Halogen reacts with acid.
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?
Why are bells made of metals?
A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain.
Match the following
| i. | Silica | a. | Caustic potash |
| ii. | Potassium hydroxide | b. | Sand |
| iii. | Sodium hydroxide | c. | Calamine |
| iv. | Zinc carbonate | d. | Caustic soda |
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
Metal atoms tend to have a maximum of ______ electrons in the outermost shell.
