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प्रश्न
What is an alloy?
उत्तर
The homogeneous mixture formed by mixing a metal with other metals or nonmetals in certain proportion is called an alloy.
संबंधित प्रश्न
Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties
| Properties | Metals | Non-metals |
| 1. Appearance | Lustrous | Dull |
| 2. Hardness | Hard | Soft |
| 3. Malleability | Can be beaten into thin sheets | Cannot be beaten into thin sheets |
| 4. Ductility | Can be drawn into wires | Cannot be drawn into wires |
| 5. Heat Conduction | Good conductors of heat | Poor conductors of heat |
| 6. Conduction of Electricity | Good conductors of electricity | Poor conductors of electricity |
Choose the correct answer from the options given below :
The two main metals in Bronze are:
(A) Copper and zinc
(B) Copper and lead
(C) Copper and nickel
(D) Copper and tin
Write a balanced chemical equation for the action of heat on aluminium hydroxide.
Write the balanced chemical equation to prepare ammonia gas in the laboratory by using an alkali.
Name two metals which are used for making electric wires.
Name two metals which are used for making jewellery and to decorate sweets.
Name the non-metal which is used as a rocket fuel (in liquid form).
What is meant by "brittleness"? Which type of elements usually show brittleness: metals or non-metals?
Name two metals whose melting points are so low that they melt when held in the hand.
Name a metal which is so soft that it can be cut with a knife.
Name a non-metal which is extremely hard.
State any three differences between the physical properties of metals and non-metals.
State three reasons (of which at least one must be chemical) for believing that sulphur is a non-metal.
Which of the following alloys contains a non-metal as one of the constituents?
(a) brass
(b) amalgam
(c) steel
(d) bronze
State two important uses of following non-metals
Uses of nitrogen
Name the three classes in which elements are classified. Which was the first metal used by man?
Define metal and non-metal on the basis of electron loss or gain.
Name:
a non-metal with high m.p & b.p
Name:
a metal which can float on water
Name:
a metal which can be cut with a knife.
Distinguish between metals and non metals on the basis of:
(i) ion formation, (ii) discharge of ions, (iii) nature of oxide formed, (iv) oxidizing and reducing property, (v) reaction with acids.
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Amphoteric oxide …………
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Acidic oxide ………………
Name:
a non metal which is lustrous
Name:
the most abundant metal and the most abundant non=metal
Write scientific reason.
Sodium metal is kept in kerosene.
What are the metals that make the alloys brass and bronze?
Which metal occurs as a carbonate also gives the name of their respective ore.
Gold and silver are used to make jewellery. Give reason
Name the following:
An Alloy of copper and Zinc.
With reference to the physical properties of metals and non-metals, state the following exception.
A non-metal which has low tensile strength
Differentiate between metals and non-metals with reference to –
(a) number of electrons in outer or valence shell
(b) formation of cation and anion
(c) reaction with dilute acids.
State whether the statement given below is true or false. If false write the correct statement.
Lead pencils contain lead.
_______ is good conductor of heat but bad conductor of electricity.
Find the odd one out and give its explanation.
______ is the only non-metal which conducts electricity.
Tabulate the differences between metals and non-metals.
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
Paheli bought a statue made up of copper. To her surprise, it acquired a dull green coating after a couple of months. Explain the reason.
