Question
How many sodium ions and chloride ions are present in a
unit cell of sodium chloride crystal? ÂSolution
(i) For a crystal of sodium the type if lattice in which it crystallises is Face Centered Cubic (fcc). (ii) The co-ordination number of each sodium ion and chloride ion in the crystal lattice is 6:6. (iii) The number of sodium ions and chloride ions present in a unit cell is 4 each. (iv) The structural arrangement of the sodium chloride crystal is cubic close packing with Cl− ions at corners and face centres and Na+ ions at edge centres and body centre, With respect to Na+ ion it is octahedral.
Statement: X>W=Y>N≤P; W≥Z ;Z ≥P
I. X>Z
II. W≥P
Statements:
J $ R % U % C
Conclusions:
I. R © C
II. J * U
III. C % J
In the following question the relationship between different elements is given in the statements followed by three conclusions I, II and III. Read the...
Statements: Z > X = A ≥ V > W > B; B = Y ≥ U = E > T
Conclusions:
I. Z > U
II. Y > Z
Statements: E > O, S < Z, O ≤ S
Conclusions:
I. E < S
II. O < Z
Statement: A≤T<B =C ≤P<D;D>J ≥S
I. C >S
II. J < D
Statements: M > Q ≥ U = O, S = U < R ≤ T
Conclusions :I. M < R  II. T > O   III. Q ≥ T
In the question, assume the given statements to be true. Find which of the following conclusion(s) among the three conclusions is/ are definitely true ...
Statements: M > N > P ; P = Q ; N < R
Conclusions:
I. Q < N
II. P < M
III. M > R
Statements:
S ≥ T ≤ D > P; F ≥ T > J ≥ Y
Conclusions:
I) Y < S
II) F > P
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