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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. |
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संबंधित प्रश्न
Define the following term: Primitive unit cells
What is meant by the term ‘coordination number’?
An ionic crystal lattice has `r^+/r` radius ratio of 0.320, its coordination number is __
(a) 3
(b) 4
(c) 6
(d) 8
For a crystal of sodium chloride, state the type of lattice in which it crystallises.
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.
How will you obtain pure potassium permanganate (KMnO4) crystals from its ore, pyrolusite? Give the steps involved and the reactions.
In a solid atom M occupies ccp lattice and `(1/3)` of tetrahedral voids are occupied by atom N. find the formula of solid formed by M and N.
A solid compound XY has NaCl structure. if the radius of the cation is 100 pm, the radius of the anion will be
The yellow colour in NaCl crystal is due to ____________.
How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g? [Atomic masses: Na = 23, Cl = 35.5]
