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प्रश्न
What is the hybridisation of carbon atom in diamond and graphite?
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उत्तर
Hybridisation of carbon atom in diamond is sp3 and that in graphite is sp2.
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संबंधित प्रश्न
The relation a ≠ b ≠ c and α ≠ β ≠ γ represents which crystal system?
(A) Orthorhombic
(B) Tetragonal
(C) Triclinic
(D) Monoclinic
Why are solids rigid?
Classify the following as amorphous or crystalline solids:
Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.
Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?
What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass?
‘Stability of a crystal is reflected in the magnitude of its melting points.’ Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?
Why does sodium chloride on heating with sodium vapours acquire yellow colour?
Which among the following is not an example of amorphous solids?
Assertion: Stability of a crystal is reflected in the magnitude of its melting.
Reason: The stability of a crystal depends upon the strength of the interparticle attractive force.
“Crystalline solids are anisotropic in nature″. What is the meaning of anisotropic in the given statement?
Which of the following is not a crystalline solid?
Which of the following statement is not true about amorphous solids?
Why some glass objects from ancient civilisations are found to become milky in appearance?
Which of the following amorphous solid is used as photovoltaic material for conversion of sunlight into electricity?
Which one of the following is non-crystalline or amorphous?
Which of the following is true about the value of refractive index of quartz glass?
Which of the following features are not shown by quartz glass?
(i) This is a crystalline solid.
(ii) Refractive index is same in all the directions.
(iii) This has definite heat of fusion.
(iv) This is also called super cooled liquid.
Under which situations can an amorphous substance change to crystalline form?
The property of crystalline solid is not ______.
Assertion A: Sharp glass edge becomes smooth on heating it upto its melting point.
Reason R: The viscosity of glass decreases on melting.
Choose the most appropriate answer from the options given below.
