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प्रश्न
Name the hardest natural substance known.
उत्तर
Diamond is the hardest natural substance known.
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संबंधित प्रश्न
Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its compounds.
Name the element whose one of the allotropic forms is buckminsterfullerene.
How does graphite act as a lubricant?
Explain why, graphite can be used as a lubricant but diamond cannot.
Why are covalent compounds generally poor conductors of electricity?
Buckminsterfullerene is an allotropic form of the element:
(a) phoshorus
(b) fluorine
(c) carbon
(d) sulphur
Which of the following cannot exhibit isomerism?
(a) C4H10
(b) C5H12
(c) C3H8
(d) C6H14
You can buy solid air-freshners in shops. Do you think these substance are ionic or covalent? Why?
For each compound mentioned above give the formulae of ions formed in aqueous solution.
Explain the structure of Hydronium ion.
State the type of bond formed, and draw Lewis structure of water.
Covalent bonds can be single, double or triple covalent bonds. How many electrons are shared in each? Give an example of each type.
Define a covalent bond.
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?
Write an Explanation.
Alkyne
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 ______.
Which of the following compound(s) possesses a high melting point?
Show the covalent bond formation in nitrogen molecule.
