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प्रश्न
You can buy solid air-freshners in shops. Do you think these substance are ionic or covalent? Why?
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उत्तर
These substances are covalent in nature because bonding between covalent substances are not as strong as ionic substances. So, covalent compounds hold together with weak forces and low melting point. This is why, they vapourise easily and give their odours. However, when ionic compounds comes in contact with air, they cannot give an odour by vapourising.
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संबंधित प्रश्न
What would be the electron dot structure of carbon dioxide which has the formula CO2?
Give appropriate scientific reasons for Carbon tetrachloride does not conduct electricity.
What type of chemical bond is formed between carbon and bromine?
Fill in the blanks in the following sentence:
In forming oxygen molecule, .............. electrons are shared by each atom of oxygen.
Fill in the blank in the following sentence:
The number of single covalent bonds in C2H2 molecule are ...........
Draw the electron-dot structure of HCl compound and state the type of bonding.
Explain why, diamond is hard while graphite is soft (though both are made of carbon atoms).
The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was:
(a) glucose
(b) urea
(c) uric acid
(d) vinegar
Explain the following:
polar covalent compounds electricity.
Explain the following:
Covalent compounds have low melting and boiling point.
The molecule which contains a triple covalent bond is ______.
The following table shows the electronic configuration of the elements W, X, Y, Z:
|
Element |
W |
X |
Y |
Z |
|
Electronic |
2,8,1 |
2,8,7 |
2,5 |
1 |
Answer the following questions based on the table above:
What type of bond is formed between Y and Z.
Electrons are getting added to an element Y:
Is Y getting oxidised or reduced?
Element A has 2 electrons in its M shell. Element B has atomic number 7.
Write equations to show how A and B form ions.
Name a greenish-yellow gas which also bleaches.
Write a short note.
Characteristics of carbon
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
 |
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
 |
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
Statement (A): Covalent compounds are bad conductors of electricity.
Reason (B): Covalent compounds contain charged particles (ions)
