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प्रश्न
State one use of diamond which depends on its 'extraordinary brilliance' and one use of graphite which depends on its being 'black and quite soft'.
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उत्तर
1. Diamonds are used in making jewellery because of their extraordinary shine and texture.
2.Graphite is used in making pencil leads (black core of pencils) because of its black colour and softness.
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संबंधित प्रश्न
Ethane, with the molecular formula C2H6 has ______.
Explain the bonding in methane molecule using electron dot structure.
Name the element whose one of the allotropic forms is buckminsterfullerene.
Give one example of a molecule containing a double covalent bond
Fill in the blank in the following sentence:
Two chlorine atoms combine to form a molecule. The bond between them is known as ..........
What is a covalent bond?
One of the following contains a double bond as well as single bonds. This is:
(a) CO2
(b) O2
(c) C2H4
(d) C2H2
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.
Give two example in following case:
Liquid non polar compounds
Elements forming ionic compounds attain noble gas electronic configuration by either gaining or losing electrons from their valence shells. Explain giving reason why carbon cannot attain such a configuration in this manner to form its compounds. Name the type of bonds formed in ionic compounds and in the compounds formed by carbon. Also explain the reason why carbon compounds are generally poor conductors of electricity.
Explain the following term with example.
Alkane
Choose the correct answer from the options given below
Which one is not example of polar covalent compound?
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?
Draw an electron dot diagram to show the formation of the following compound.
Magnesium chloride [ H=1, C=6, Mg=12, Cl=17].
Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the options A, B, C and D given below:
The type of bonding in X will be ______.
Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the options A, B, C and D given below:
X is likely to have a ______.
Name the anion present in the following compound:
When a barium chloride solution is added to a solution of compound B, a white precipitate insoluble in dilute hydrochloric acid is formed.
Fill in the blank and rewrite the completed statement:
Covalent compounds are generally soluble in _________ solvents.
Explain covalent bond with example.
Mineral acids are stronger acids than carboxylic acids because
- mineral acids are completely ionised
- carboxylic acids are completely ionised
- mineral acids are partially ionised
- carboxylic acids are partially ionised
