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प्रश्न
What is diamond? Of what substance is diamond made?
उत्तर
Diamond, which is a colourless and transparent substance, is an allotrope of carbon. It is the hardest natural substance known. Diamonds are purely made of carbon and the symbol is C. When we burn diamond in oxygen, only carbon dioxide is evolved showing that diamond is made up of carbon.
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संबंधित प्रश्न
Explain why carbon forms compounds mainly by covalent bond.
What type of bonds are present in Cl2 molecule? Draw their electron-dot structures.
Fill in the following blank with suitable word:
The form of carbon which is known as black lead is ...........
What type of bonds are present in CO2 molecule? Draw their electron-dot structures.
State one test by which sodium chloride can be distinguished from sugar.
Friedrich Wohler converted an inorganic compound into an organic compound in the laboratory.
Write the name and formula of organic compound formed.
Give the formula of the compound that would be formed by the combination of the following pair of elements:
K and H
Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of nitrogen, N2, is formed from two nitrogen atoms. What name is given to this type of bonding? (Atomic number of nitrogen is 7)
Draw the electron-dot structure of CO2 compound and state the type of bonding.
The number of covalent bonds in pentane (molecular formula C5H12) is:
Which of the following cannot exhibit isomerism?
(a) C4H10
(b) C5H12
(c) C3H8
(d) C6H14
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is:
(a) fifty
(b) sixty
(c) seventy
(d) ninety
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.
Complete the following:
In case of non-polar covalent bond, the covalent bond is formed in the ______ of atoms and shared electrons are ______ distributed. (corner, middle, equally, unequally)
Draw all possible structural formulae of compound from their molecular formula given below.
C3H8
The covalent bond in which the electrons are shared equally between the combining atoms.
Explain the following briefly:
Sodium chloride dissolves in water but carbon tetra chloride is insoluble in water.
Draw the electron dot diagram and structure of magnesium chloride.
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\ |\phantom{....}|\phantom{....}|\\\ce{H - C - C - C - H}\\ |\phantom{....}|\phantom{....}|\\\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H} \end{array}\] |
It is observed that covalent compounds are had conductors of electricity. Give reason.
