IIT-JEE
CHEMISTRY
P. JOY
PROMOTIONAL MATTER
Q.1 A metal crystallises into a lattice containing a sequence of
layers of ABC ABC ........... . If the radius of metal atoms
is 174 pm, then the distance between the two successive
layers (i.e., A and B) is-
(A) 348 pm (B) 174 pm (C) 284.2 pm (D) 492.2 pm
Q.2 Barium titanate has the perovskit structure which is a cubic
lattice, with barium ions occupying the corners of the unit
cell, oxide ions the face centers and titanium ions the
centres. Assuming that Ti
4+
ions are occupying the holes
of the BaO lattice, what type of holes and what fraction of
such holes does the ion occupy ?
(A) 50% Tetrahedral holes
(B) 25% Octahedral holes
(C) 100% Octahedral holes
(D) 25% Tetrahedral holes
Q.3 The two bulbs R and S connected by a mercury manometer
are held in a thermostat (to maintain constant temp.) Volume
of R is twice the volume of S. R contains a gas X at the same
pressure of nitrogen as in S. The mercury level in the right
ha nd limbrises whe n temperature is increased if th e gas X is
(A) Nitrogen
(B) An equilibrium mixture CH
3
NC(g)
CH
3
NC(g)
DH is negative.
(C) An equilibrium mixture N
2
F(g)
2NF(g)
DH is positive.
(D) Hydrogen.
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or
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To open video solution go to
https://ables.online/20video
or
Scan following QR Code