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प्रश्न
Fill in the blank in the following sentence:
Two chlorine atoms combine to form a molecule. The bond between them is known as ..........
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उत्तर
Two chlorine atoms combine to form a molecule. The bond between them is known as a covalent bond.
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संबंधित प्रश्न
State the reason why carbon can neither form C4+ cations nor C4− anions but forms covalent compounds.
What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? (Hint – the eight atoms of sulphur are joined together in the form of a ring.)
Explain the nature of the covalent bond using the bond formation in CH3Cl.
Explain the bonding in methane molecule using electron dot structure.
Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit?
Name a carbon containing molecule which has two double bonds.
State one test by which sodium chloride can be distinguished from sugar.
Describe the structure of graphite with the help of a labelled diagram.
Which of the following has a triple bond as well as single bonds?
(a) ethene
(b) methane
(c) ethyne
(d) nitrogen
The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was:
(a) glucose
(b) urea
(c) uric acid
(d) vinegar
You can buy solid air-freshners in shops. Do you think these substance are ionic or covalent? Why?
An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
(a) Name the element E.
(b) What is allotrope A.
(c) What is allotrope B?
(d) What is allotrope C?
(e) Which allotrope is used in making jewellery?
(f) Which allotrope is used in making anode of a dry cell?
What are the conditions necessary for the formation of covalent molecules?
Give the characteristic properties of covalent compounds.
Give examples for the following:
Two solid covalent compounds.
Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in?
Explain the following:
Polar covalent compounds conduct electricity?
Generally, the melting and boiling point of carbon compounds are found to be less than _______ °C.
When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula ______.
Which of the following statements are correct for carbon compounds?
- Most carbon compounds are good conductors of electricity.
- Most carbon compounds are poor conductors of electricity.
- Force of attraction between molecules of carbon compounds is not very strong.
- Force of attraction between molecules of carbon compounds is very strong.
