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प्रश्न
Define a covalent bond.
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उत्तर
The chemical bond formed between two combining atoms by mutual sharing of one or more pairs of electrons is called a covalent bond.
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संबंधित प्रश्न
Ethane, with the molecular formula C2H6 has ______.
What type of bonds are present in H2 molecule? Draw their electron-dot structures.
Fill in the following blank with suitable word:
The form of carbon which is known as black lead is ...........
Give two general properties of ionic compounds and two those of covalent compounds.
Explain why, diamond can be used in rock drilling equipment but graphite cannot.
The atomic numbers of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound?
(a) P and R
(b) Q and S
(c) P and S
(d) R and S
Buckminsterfullerene is an allotropic form of the element:
(a) phoshorus
(b) fluorine
(c) carbon
(d) sulphur
Which of the following has a triple bond as well as single bonds?
(a) ethene
(b) methane
(c) ethyne
(d) nitrogen
Explain the following:
polar covalent compounds electricity.
State the type of bonding in the following molecule.
Methane
Explain the following term with example.
Covalent bond
Explain the following briefly.
Pure water does not conduct electricity, but on adding sodium chloride to it, it starts conducting electricity.
Explain the following:
Covalent compounds have low melting and boiling point.
Fill in the blank with correct word from the bracket.
Melting and boiling points of covalent compounds are generally ______ (low, high).
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc}\phantom{......}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}\\ \phantom{.....}|\phantom{....}|\phantom{....}|\\ \ce{H - C - C = C}\\\phantom{.....}|\phantom{.........}|\\ \phantom{.....}\ce{H}\phantom{........}\ce{H}\end{array}\] |
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
 |
State the reasons, why carbon cannot
- Lose four electrons to form C4+ cation and
- Gain four electrons to form C4- anion.
How does carbon overcome this problem to form compounds?
Assertion (A): Melting point and boiling point of ethanol are lower than that of sodium chloride.
Reason (R): The forces of attraction between the molecules of ionic compounds are very strong.
Non-polar covalent compounds are ______ conductors of heat and electricity.
Explain dipole (polar) molecule by taking hydrogen chloride as an example.
