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प्रश्न
State any two uses of graphite.
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उत्तर
Uses of graphite:
(1) As graphite is a good conductor of electricity, it is used in making carbon electrodes in dry cells.
(2) Graphite is used in making pencil leads and black paints.
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संबंधित प्रश्न
State the type of bonding in the following molecule.
Water
What type of bond is present in oxygen molecule?
A saturated hydrocarbon has fifty hydrogen atom in its molecule. The number of carbon atoms in its molecule will be
(a) twenty five
(b) twenty four
(c) twenty six
(d) twenty seven
The electronic configurations of three elements X, Y and Z are as follows:
| X | 2, 4 |
| Y | 2, 7 |
| Z | 2, 1 |
(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.
Give two example in following case:
Solid covalent compounds
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methane
Explain the structure of Hydronium ion.
Explain the following:
Covalent compounds have low melting and boiling point.
Fill in the blank from the choice given in bracket.
The compound that does not have a lone pair of electrons is ___________. (Water, Ammonia, carbon tetrachloride)
Electrons are getting added to an element Y:
which electrode will Y migrate to during the process of electrolysis?
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?
Number of valence electrons in a carbon atom is _______.
Write scientific reason.
Carbon has the property of forming many compounds.
Write a short note.
Characteristics of carbon
Give an example for each of the following statement
A compound in which two Covalent bonds are formed.
Cation is formed when ______.
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.
Carbon can neither form C4- cation nor C4 anion. Why?
Name the following:
\[\ce{CH3 - CH2CH = CH2}\]
