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प्रश्न
Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of
विकल्प
helium
neon
argon
krypton
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उत्तर
neon
Explanation -
Carbon shares its valence electrons with other atoms of carbon or with atoms of other elements. The shared electrons belong to the outermost shells of both the atoms and lead to both atoms attaining the noble gas configuration. After sharing four electrons with four univalent atoms, carbon attains the electronic configuration of the noble gas Neon (2,8).
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संबंधित प्रश्न
Write structural formula of Methane.
List three characteristic properties of covalent compounds.
Write the electron-dot structure for the following molecule.
Cl2
What type of bonds are present in Cl2 molecule? Draw their electron-dot structures.
Give two general properties of ionic compounds and two those of covalent compounds.
Two non-metals combine with each other by the sharing of electrons to form a compound X.
(a) What type of chemical bond is present in X?
(b) State whether X will have a high melting point or low melting point.
(c) Will it be a good conductor of electricity or not?
(d) Will it dissolve in an organic solvent or not?
The electronic configurations of two elements A and B are given below:
| A | 2, 6 |
| B | 2, 8, 1 |
(a) What type of chemical bond is formed between the two atoms of A?
(b) What type of chemical bond will be formed between the atoms of A and B?
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Ethene
The following structural formula belongs to which carbon compound?
Explain the following:
Non-polar covalent compounds are insoluble in water.
The electronic configuration of N2 is 2, 5. How many electrons in the outer shell of a N atom are not involved in the formation of a nitrogen molecule?
Draw an electron dot diagram to show the formation of the following compound.
Magnesium chloride [ H=1, C=6, Mg=12, Cl=17].
Draw the electron dot diagram and structure of :
methane
Potassium (Atomic No. 19) and chlorine (Atomic No. 17) react to form a compound. On the basis of electronic concept, explain
(i) oxidation
(ii) reduction
(iii)oxidising agent
(iv)reducing agent
Taking MgCl2 as an electrovalent compound, CCl4 as a covalent compound, give four difference between electrovalent and covalent compounds
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc} \phantom{..}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\ \phantom{..}|\phantom{....}|\phantom{....}|\\ \ce{H - C - C- C- H}\\ \phantom{.}|\phantom{....}|\phantom{....}|\\ \ce{H - C - H}\\ |\\\ce{H}\end{array}\] |
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
 |
Mineral acids are stronger acids than carboxylic acids because
- mineral acids are completely ionised
- carboxylic acids are completely ionised
- mineral acids are partially ionised
- carboxylic acids are partially ionised
Show the covalent bond formation in nitrogen molecule.
