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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.
संबंधित प्रश्न
List three characteristic properties of covalent compounds.
Write the electron-dot structure for the following molecule:
Cl2
Compare the properties of ionic compounds and covalent compounds.
will CCl4 conduct electricity or not?
give reason for your choice.
Draw the electron-dot structure of a hydrogen chloride molecule:
- Which inert gas does the H atom in HCl resemble in electron arrangement?
- Which inert gas does the Cl atom in HCl resemble in electron arrangement?
Which inert gas does the H atom in HCl resemble in electron arrangement?
Of what substance is graphite made?
Two non-metals combine with each other by the sharing of electrons to form a compound X.
- What type of chemical bond is present in X?
- State whether X will have a high melting point or low melting point.
- Will it be a good conductor of electricity or not?
- Will it dissolve in an organic solvent or not?
A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads.
(a) What is element X?
(b) Name the allotrope Y.
(c) State whether allotrope Y is a good conductor or non-conductor of electricity.
(d) Name one use of allotrope Y (other than lubrication and pencil leads)
(e) Name two other allotropes of element X.
Write answer as directed.
Saturated hydrocarbons are classified into three types. Write these names giving one example each.
Draw electron - dot structure and structural formula of methane.
Explain the following:
Covalent compounds are generally gases or liquids or soft solids.
Explain the following:
Water is a polar covalent molecule.
Name two compounds that are covalent when taken pure but produce ions when dissolved in water.
The molecular masses of a carbon compound spread over a range of _______.
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
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Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was evolved. The gas was passed through lime water, which turned milky. It was concluded that ______.
Which of the following statements are usually correct for carbon compounds? These
- are good conductors of electricity
- are poor conductors of electricity
- have strong forces of attraction between their molecules
- do not have strong forces of attraction between their molecules.
Although metals form basic oxides, which of the following metals form an amphoteric oxide?
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
