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प्रश्न
Fill in the following blank with suitable word:
The form of carbon which is known as black lead is ...........
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उत्तर
The form of carbon which is known as black lead is graphite.
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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.
Fill in the following blank with suitable word:
The general formula CnH2n for cycloalkanes is the same as that of ...........
Which inert gas does the Cl atom in HCl resemble in electron arrangement?
Buckminsterfullerene is an allotropic form of the element:
(a) phoshorus
(b) fluorine
(c) carbon
(d) sulphur
The pencil leads are made of mainly:
(a) lithium
(b) charcoal
(c) lead
(d) graphite
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.
The covalent bond in which the electrons are shared equally between the combining atoms.
Explain the following briefly.
Pure water does not conduct electricity, but on adding sodium chloride to it, it starts conducting electricity.
Explain the following:
Polar covalent compounds are good conductors of electricity.
Acids dissolve in water to produce positively charged ions. Draw the structure of these positive ions.
Explain why Carbon tetrachloride does not dissolve in water.
What are the term defined below?
A bond formed by share pair of electrons, each bonding atom contributing one electron to the pair.
Name two compounds that are covalent when taken pure but produce ions when dissolved in water.
Name two compounds that are covalent when taken pure but produce ions when dissolved in water.
Give an example of the covalent bond formed by
(i) Similar atoms (ii) Dissimilar atoms
Generally, the melting and boiling point of carbon compounds are found to be less than _______ °C.
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 ______.
In covalent bond formation, the sharing of ______ electrons takes place in their outermost shell.
Name the following:
\[\ce{CH3 - CH2CH = CH2}\]
