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प्रश्न
what substance is graphite made?
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उत्तर
On burning graphite in the presence of oxygen, only carbon dioxide gas is evolved proving that graphite is only made of carbon.
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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.
What would be the electron dot structure of carbon dioxide which has the formula CO2?
What type of bonds are present in hydrogen chloride and oxygen?
What type of bonds are present in H2 molecule? Draw their electron-dot structures.
Fill in the blank in the following sentence:
The number of single covalent bonds in C2H2 molecule are ...........
What type of chemical bonds are formed by carbon? Why?
What type of bonding would you expect between Hydrogen and Chlorine?
State any two uses of graphite.
The molecules having triple bond in them are:
(a) oxygen and ethyne
(b) carbon dioxide and ammonia
(c) methane and ethene
(d) nitrogen and ethyne
Give two example in following case:
Gaseous polar compounds
State the type of bonding in the following molecule.
Water
Electrons are getting added to an element Y:
Is Y getting oxidised or reduced?
Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.
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?
Write an Explanation.
Alkene
Write a short note.
Aromatic hydrocarbons
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc}\phantom{......}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}\\ \phantom{.....}|\phantom{....}|\phantom{....}|\\ \ce{H - C - C = C}\\\phantom{.....}|\phantom{.........}|\\ \phantom{.....}\ce{H}\phantom{........}\ce{H}\end{array}\] |
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
 |
Discuss in brief about the properties of coordinate covalent compounds.
Show the covalent bond formation in nitrogen molecule.
