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प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
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उत्तर
- The compounds formed from two units, namely cation and anion are called ionic compounds.
- The cation and anion being oppositely charged, there is an electrostatic force of attraction between them. This force of attraction between cation and anion is called as the ionic bond.
- The number of cations and anions in a compound and the magnitude of the electric charge on them is such that the positive and negative charges balance each other. As a result, an ionic compound is electrically neutral.
- For example, ionic compound sodium chloride (NaCl) is formed as sodium metal gives away one electron while the nonmetal chlorine takes up one electron. Na+ and Cl− ions formed are held together by attractive force called ionic bond.
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संबंधित प्रश्न
Name two metals which are found in nature mainly in the free state (as metallic elements).
What is the difference between a mineral and an ore?
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
How is aluminium metal extracted? Explain with the help of an equation.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Give the chemical formula of :
Sodium aluminate
Which method of refining is used to get 99.8% pure aluminium?
Explain the following:
Galvanization protects iron from rusting.
Name:
The allotrope of the non-metal carbon which conducts electricity.
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Usually ______ ores are subjected to ______ which is done in the absence of air.
Froth floatation process is generally used to concentrate ______ ores.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Write the name.
The molecular formula of main ore of aluminium –
Gold and silver are active metals.
Write the molecular formulae of the following compound.
Cryolite
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain Bayer’s process of concentration of bauxite with a chemical equation.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
