List of top Nano Science Questions on Solid State

The packing fraction of a crystal structure is 74%. The crystal structure is

Which of the following exists as a covalent crystal in the solid state?

(A) Sulphur
(B) Iodine
(C) Phosphorus
(D) Silicon
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In Cubic lattice,

(A) For face centered cubic (fcc) lattice, effective number of atoms per unit cell is 2
(B) For body centered cubic (bcc) lattice, effective number of atoms per unit cell is 4
(C) \(a = b = c\), and \(\alpha = \beta = \gamma = 90^\circ\), where \(a\), \(b\), \(c\) are edge lengths and \(\alpha\), \(\beta\), \(\gamma\) are axial angles
(D) For simple cubic (sc) lattice, effective number of atoms per unit cell is 1
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Which of the following are correct statements?

(A) Hydrogen bond is weaker than covalent bond.
(B) CH\(_4\) has covalent bonds.
(C) Covalent compounds do not conduct electricity except diamond.
(D) Graphite is a soft solid and a good conductor of electricity.
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