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प्रश्न
Name the hardest natural substance known.
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उत्तर
Diamond is the hardest natural substance known.
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संबंधित प्रश्न
Choose the most appropriate answer from the following list of oxides which fit the description.
A covalent oxide of a metalloid.
What type of bonds are present in hydrogen chloride and oxygen?
Draw the electron-dot structure of CO2 compound and state the type of bonding.
Describe the structure of graphite with the help of a labelled diagram.
The number of covalent bonds in pentane (molecular formula C5H12) is:
One of the following compounds is not ionic in nature. This compound is:
(a) Lithium chloride
(b) Ammonium chloride
(c) Calcium chloride
(d) Carbon tetrachloride
A hydrocarbon having one double bond has 100 carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be
(a) 200
(b) 198
(c) 202
(d) 196
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is:
(a) fifty
(b) sixty
(c) seventy
(d) ninety
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?
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methanol
Give examples for the following:
Two liquid non polar compounds.
What is the term defined below?
A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.
Explain why carbon tetrachloride does not dissolve in water.
Define a covalent bond.
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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Considering MgCl2 as ionic compound and CH4 as covalent compound give any two differences between these two compounds.
Which of the following is the formula of Butanoic acid?
Which of the following compound(s) possesses a high melting point?
In covalent bond formation, the sharing of ______ electrons takes place in their outermost shell.
Explain dipole (polar) molecule by taking hydrogen chloride as an example.
