Advertisements
Advertisements
प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
Name the method by which aluminium metal is extracted.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Define the term:
Flux
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Sodium aluminate
Care must be taken while diluting concentrated nitric acid with water. Why?
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.
