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प्रश्न
Give reasons
Aluminium is used in making aircrafts.
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उत्तर
Aluminium is used in making aircrafts because it is light and strong. It is mixed with other metals to make it stronger.
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संबंधित प्रश्न
Fill in the following blanks with suitable words:
A metal having low melting point is ..................... but a non-metal having very high melting point is ..............
The atomic number of an element X is 12.
(a) What must an atom of X do to attain the nearest inert gas electron configuration?
(b) Which inert gas is nearest to X?
How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?
What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.
A metal with melting point less than 50°C is
State two important uses of following metal.
Uses of copper
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Hydrochloric acid,
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.
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
A is a reddish-brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.
The most abundant metal in the earth’s crust is ____________.
The ability of metals to be drawn into thin wire is known as
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.
A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain.
Sodium is a hard metal.
Why are metalloids called semimetals?
