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प्रश्न
The pencil leads are made of mainly:
(a) lithium
(b) charcoal
(c) lead
(d) graphite
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उत्तर
graphite
The pencil leads are mainly made of graphite.
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संबंधित प्रश्न
Explain why carbon forms compounds mainly by covalent bond.
An element L consists of molecules.
What type of bonding is present in the particles that make up L?
What type of bonds are present in CH4 molecule? Draw their electron-dot structures.
What type of bonds are present in CO2 molecule? Draw their electron-dot structures.
Fill in the blanks in the following sentence:
In forming oxygen molecule, .............. electrons are shared by each atom of oxygen.
Fill in the blank in the following sentence:
In forming N2 molecule, .............. electrons are shared by each atom of nitrogen.
What type of chemical bonds are formed by carbon? Why?
What is buckminsterfullerene?
What are the conditions necessary for the formation of covalent molecules?
What is the difference between ionic compounds and polar covalent compounds?
Which element exhibits the property of catenation to maximum extent and why?
Draw all possile structural formulae of compound from their molecular formula given below.
C4H10
Explain the following term with example.
Hetero atom in a carbon compound
(a) Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d) given below
X is likely to have a :
Explain the following:
Water is a polar covalent molecule.
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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Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
 |
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
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
