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प्रश्न
Give one example, state what are covalent compounds?
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उत्तर
Covalent compounds are compounds that are formed by the sharing of electrons between two or more atoms.
Example: Hydrogen (H2) is a covalent compound, where each hydrogen atom shares one electron to form a stable compound.
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संबंधित प्रश्न
Write any three features and give two examples of covalent compounds
Why are most carbon compounds poor conductors of electricity?
Fill in the following blank with suitable word:
The form of carbon which is known as black lead is ...........
Why does carbon form compounds mainly by covalent bonding?
State any two uses of diamond.
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.
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 is the difference between ionic compounds and covalent compounds?
Give the characteristic properties of covalent compounds.
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?
Electrons are getting added to an element Y:
Is Y getting oxidised or reduced?
State the type of bond formed when the combining atom has zero E.N. difference.
What is the difference between a polar covalent compound and a non-polar covalent compound?
Number of valence electrons in a carbon atom is _______.
Write a short note.
Characteristics of carbon
Write a short note.
Aromatic hydrocarbons
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.
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.
Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
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.
