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प्रश्न
Give reasons
Magnesium is used in fire works.
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उत्तर
Magnesium is used in fire works because it bums with a dazzling light.
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संबंधित प्रश्न
State five uses of metals.
The atomic number of an element X is 12.
- What must an atom of X do to attain the nearest inert gas electron configuration?
- Which inert gas is nearest to X?
What is an amalgam?
What is a thermite reaction? Explain with the help of an equation.
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
Mention two uses of the following metals and non-metals
Gold
Mention two uses of the following metals and non-metals
Oxygen
Give two uses of Germanium
Fill in the blank
A metal that gives dazzling effect to crackers when they explode is ______
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.
State two important uses of following metal.
Uses of copper
Why are alkali metals kept in kerosene oil?
Which is the non-ionic compound in the compounds given below.
AgNO3 + Nacl → AgCl + NaNO3
With reference to the following metals state their use in daily life metal:
iron
The minerals from which the metal can be separated economically are called _______.
Metals are usually solids or gases at room temperature.
Why are bells made of metals?
In the following figure, you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.
- ______ is a metal.
- Metals are good ______ of electricity.
Match the following
| i. | Softest metal | a. | Copper |
| ii. | Hardest metal | b. | Sodium |
| iii. | Hardest non–metal | c. | Osmium |
| iv. | Ductility | d. | Diamond |
