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प्रश्न
How will you distinguish between the following pair of terms?
Crystal lattice and unit cell
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उत्तर
| Crystal lattice | Unit cell |
| The three-dimensional arrangement of structural units or constituent particles (atoms, molecules or ions) in a crystal is called a space lattice or crystal lattice or simply a lattice. | Unit cell is the smallest three-dimensional group of lattice points which, when repeated in three dimensions in space, gives the whole lattice of the crystal. |
संबंधित प्रश्न
Name the parameters that characterize a unit cell.
Which of the following lattices has the highest packing efficiency (i) simple cubic (ii) body-centred cubic and (iii) hexagonal close-packed lattice?
What is meant by the term ‘coordination number’?
Which of the following parameters are correct for triclinic lattice?
(A) α = β = γ = 90° and a = b = c
(B) α ≠ β ≠ γ = 90° and a ≠ b ≠ c
(C) α = γ = 90°, β ≠ 90° and a ≠ b ≠ c
(D) α ≠ β ≠ γ ≠ 90° and a ≠ b ≠ c
i)
Consider the following cell reaction at 298 K: [3]
2Ag+ + Cd → 2Ag + Cd2+
The standard reduction potentials (E°) for Ag+/Ag and Cd2-/Cd are 0.80 V and -0.40 V respectively:
(1) Write the cell representation.
(2) What will be the emf of the cell if the concentration of Cd2+ is 0.1M and that of Ag+ is 0.2 M?
(3) Will the cell work spontaneously for the condition given in (2) above?
(ii)
What is a buffer solution? How is it prepared? Explain the buffer action of a basic buffer with a suitable example.
The yellow colour in NaCl crystal is due to ____________.
Why ionic crystals are hard and brittle?
Crystals can be classified into basic crystal units, equal to ____________.
AB crystallises in a body centred cubic lattice with edge length' a' equal to 387 pm The distance between two oppositely charged ions in the lattice is:
A particular solid is very hard and has a high melting point. In solid state, it is a non-conductor and in molten state, it is a conductor of electricity. Classify the solid ______.
