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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
In the extraction of aluminium: Name the process of concentration of bauxite.
Name two metals which are found in nature mainly in the free state (as metallic elements).
Name three other metals which are extracted in a manner similar to sodium.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
Give reasons, why aluminum is used in:
making alloys
Define the following term.
Gangue
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Explain the following:
Galvanization protects iron from rusting.
Name : The metal which is liquid at room temperature.
Which one of the following is not true of metal :
Metals are good conductors of electricity.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Find the odd one out and give its explanation.
Mercury, silver, gold are highly reactive metals.
Explain in brief types of extraction of less reactive metals according to their reactivity.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
Electrical wires have a coating of an insulting material. The material, generally used is
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
