In zinc blende structure, the zinc atoms occupy
all tetrahedral sites
all octahedral sites
half of the octahedral sites
half of the tetrahedral sites
Correct Answer :
D. half of the tetrahedral sites
Related Questions
Which one of the following contains same number of molecules as 4.4 gm of carbon dioxide (mol. wt. of = 44, Mol, wt. of = 64)?
64 gm of sulphur dioxide
4.4 gm of sulphur dioxide
6.4 gm of sulphur dioxide
3.2 gm of sulphur dioxide
In NaCl type structure, the coordination number of the cation and anion are
6 and 4
6 and 6
4 and 4
8 and 4
The vapour density of a gas is 11.2. The volume occupied by 2.4 g of the gas at S.T.P wil be
2.4 litres
3.6 litres
2.24 litres
11.2 liters
The electrical conductivity of metals is of the order of
Vapour density of a gas is 35.5. The volume occupied by 3.55 gm of the gas at NTPis
1.12 litres
2.24 litres
22.4 litres
11.2 litres
In the wurtzite structure sulphur atoms have
cubic arrangement
hexagonal dose packed arrangement
body centred arrangement
None of these
The number of atoms per unit cell in simple cubic, face centred cubic and body centred cubic arrangement are, respectively
8,14,9
1,2,4
1,4,2
8,4, 2
In the ideal gas equation PV = nRT constant 'R' has the unit
joule
litre/mol
lit-atm/deg/mol
calorie/mole
When an ideal gas undergoes unrestricted expansion, no cooling occurs because the molecules
are above inversion temperature
exert no attractive force on each other
do work equal to loss in kinetic energy
collide without loss of energy
If the tetrahedral sites in ccp arrangement of negative ions (Y) were half filled with cation (X), the empirical formula of the compound would be
XY
The space occupied by spheres in ccp arrangement is
74.06%
68.05%
60.4%
52.4%
The molecular weight of a volatile liquid can be determined by
Dumas' method
Victor Meyer's method
Cryoscopic method
Osmotic pressure
Certain volume of a gas exerts on its walls some pressure at a particular temperature. It has been found that by reducing the volume of the gas to half its original value, the pressure becomes I twice that the initial value of constant temperature. This happens because
More number of a gas molecules strike the surface per second
Velocity of the gas molecules increases
Gas molecules attract each other
Weight of the gas increase with volume
One mole of gas is defined as
The number of molecules in 22.4 litres of gas at S.T.P
The number of molecules contained | in 6 grams of 12 C isotope
The number of molecules in one formula weight of gas
The number of molecules in litre of gas
The weight of 11.2 litres of at S.T.P. would be
22 gms
66 gms
11 gms
16 gms
The number of molecules in 32 gms of oxygen in
6.02 x
3.2 x
6.02 x
32 x
Volume occupied by 4.4 gift of carbon dioxide is
4.4 litres
2.24 litres
22.4 litres
4.48 litres
What is the vapour pressure of benzoyl chloride at its boiling point (197°C)?
760 torr
380 torr
197 torr
None of these
Which of the following methods is used to determine the atomic weight?
Victor Meyer's method
Dumas' method
Cannizaro's method
None of these
In what ratio by mass carbon monoxide and nitrogen should be mixed so that partial pressure exerted by each gas is same?
None of these
In a close packed arrangement of N spheres, the number of octahedral holes are
N
2N
4N
8N
A balloon filled with ethane is pricked up with sharp point and quickly plunged into a tank of hydrogen at the same pressure. After some time balloon will
be enlarged
be collapse
remain unchanged in size
have half its volume of the gas
Which of the following would you expect to affect the vapour pressure of a liquid?
Inter-molecular forces in the liquid
Volume of the liquid in the liquid-vapour equilibrium
Volume of the vapour in the liquid-vapour equilibrium
The size of the container in which liquid-vapour equilibrium is establishe
If the temperature and pressure remain unchanged the volume of obtained by the decomposition of a certain volume of will be
Triple the volume of
Half the volume of
Equal to the volume of
One third the volume of
Cubic close packed arrangement of ions is described as
ABC AB ABC.....
ABC ABC......
AB AB..........
ABC CBA...
The number of atoms in 0.004 gm of magnesium is close to
36x
5 x
6.02 x
Which of the following should be most viscous?
An open vessel at 37°C is heated until 3/5 of the air in it has been expelled. Assuming that the volume of the vessel remains constant the temperature to which the vessel is heated is
502°C
502 K
243.67°C
925C
What will be the mass of 6.03 x molecules of carbon monoxide ?
18.00
28.01
56.02
14.05
The relation between molecular wt. and vapour density is
Molecular wt. = V.D.
Molecular wt. = V.D.
Molecular wt. = V.D.
Molecualr wt = 2 x V.D.