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प्रश्न
State one major difference between covalent and ionic bonds and give one example each of covalent and ionic compounds.
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उत्तर
Covalent compounds have usually low melting points and boiling points. But ionic compounds have high melting points and boiling points.
An example for a covalent compound is methane (CH4).
An example for an ionic compound is sodium chloride (NaCl).
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संबंधित प्रश्न
List three characteristic properties of covalent compounds.
Explain why carbon forms compounds mainly by covalent bond.
Name a carbon containing molecule which has two double bonds.
Which inert gas does the H atom in HCl resemble in electron arrangement?
What type of bonding would you expect between Carbon and Chlorine?
What is graphite?
Which of the following has a triple bond as well as single bonds?
(a) ethene
(b) methane
(c) ethyne
(d) nitrogen
Explain the following briefly.
Pure water does not conduct electricity, but on adding sodium chloride to it, it starts conducting electricity.
Explain the following briefly:
Cl2 is a non polar molecule, while HCl is a polar molecule.
Explain the structure of Ammonium ion.
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.
If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the ______ and B at the ______ of the electrolytic cell.
Covalent bonds can be single, double or triple covalent bonds. How many electrons are shared in each? Give an example of each type.
In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?
Answer the following question.
What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds:
(i) poor conductors of electricity? and
(ii) have low melting and boiling points? What happens when this compound burns in oxygen?
Generally, the melting and boiling point of carbon compounds are found to be less than _______ °C.
The table shows the electronic structures of four elements.
| Element | Electronic Structure |
| P | 2, 6 |
| Q | 2, 8, 1 |
| R | 2, 8, 7 |
| S | 2, 8, 8 |
- Identify which element(s) will form covalent bonds with carbon.
- “Carbon reacts with an element in the above table to form several compounds.” Give suitable reason.
Statement (A): Covalent compounds are bad conductors of electricity.
Reason (B): Covalent compounds contain charged particles (ions)
Name the following:
\[\ce{CH3 - CH2CH = CH2}\]
The number of single and double bonds present in a molecule of benzene (C6H6) respectively, are ______.
