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प्रश्न
Fill in the following blank with suitable word:
The form of carbon which is known as black lead is ...........
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.
Write any three features and give two examples of covalent compounds
What type of chemical bonds are formed by carbon? Why?
will CS2 conduct electricity or not?
give reason for your choice.
Draw the electron-dot structure of CO2 compound and state the type of bonding.
Explain why, diamond is hard while graphite is soft (though both are made of carbon atoms).
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.
Draw an electron dot diagram for the formation of the following. State the type of bonding present in them.
Hydroxyl ion
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Ethene
Draw all possile structural formulae of compound from their molecular formula given below.
C4H10
Choose the correct answer from the options given below
Condition favorable for formation of a covalent bond is
Explain why Carbon tetrachloride does not dissolve in water.
Draw the electron dot diagram and structure of nitrogen molecule.
Potassium (Atomic No. 19) and chlorine (Atomic No. 17) react to form a compound. On the basis of electronic concept, explain
(i) oxidation
(ii) reduction
(iii)oxidising agent
(iv)reducing agent
Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound, But, both conduct electricity in their aqueous solutions. Explain.
Answer the following question.
What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds:
(i) poor conductors of electricity? and
(ii) have low melting and boiling points? What happens when this compound burns in oxygen?
Number of valence electrons in a carbon atom is _______.
From the following hydrocarbon _______ is the cyclic hydrocarbon.
Two carbon atoms can always form one or two covalent bonds.
In covalent compounds, the bond is formed due to ______ of electrons.
