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प्रश्न
Graphite and diamond are ____________.
विकल्प
covalent and molecular crystals
ionic and covalent crystals
both covalent crystals
both molecular crystals
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उत्तर
Graphite and diamond are both covalent crystals.
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संबंधित प्रश्न
Distinguish between crystalline solids and amorsphous solids.
An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube. the correct formula of AxBy is
Assertion: monoclinic sulphur is an example of a monoclinic crystal system
Reason: for a monoclinic system, a ≠ b ≠ c and α = γ = 90°, β ≠ 90°
Classify the following solid.
Iodine
Lithium crystallizes into body centered cubic structure. What is the radius of lithium if edge length of it's unit cell is 351 pm?
Which among the following is not true for crystalline solid?
Which among the following is an example of non-polar molecule?
The hardest substance among the following is:
An excess of potassium ions makes KCl crystals appear violet or lilac in colour since:
(i) some of the anionic sites are occupied by an unpaired electron.
(ii) some of the anionic sites are occupied by a pair of electrons.
(iii) there are vacancies at some anionic sites.
(iv) F-centres are created which impart colour to the crystals.
A crystal with a ≠ b ≠ c and α = β = γ = 90° is
