Which of the following is an example of covalent network solid?
Sodium
Solid carbon dioxide
Sodium chloride
Silicon
Correct Answer :
D. Silicon
Related Questions
How many moles of water are present in 180 gm. of water ?
11
5
90
21
In the ideal gas equation PV = nRT constant 'R' has the unit
joule
litre/mol
lit-atm/deg/mol
calorie/mole
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
In a face centred cubic arrangement of ions, the coordination number of ions is
6
8
12
4
Which of the following should be most viscous?
The weight of 11.2 litres of at S.T.P. would be
22 gms
66 gms
11 gms
16 gms
The V.D. of a gas is 11.2 gm. The volume occupied by 11.2 gm. of this gas at N.T.P. is
12 litre
11.2 litres
2.24 litres
22.4 litres
In a dose packed arrangement of N spheres, the number of tetrahedral holes are
N
2N
N/2
Of the following properties, the magnitude of one must always increase with temperature. The property is
vapour pressure
density
surface tension
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
Lattice energy of a solid is high if
the radii of the ions are large
radii of the ions are small
charge on the ions are small
the ions are neutral
Four 1 litre flasks are separately filled with hydrogen, helium, oxygen and ozone gases at the same temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be
1:1:1:1
1:2:2:3
2:1:2:3
3:2:2:1
In a closed packed structure the pattern ABAB...... represents which one of the following:
ccp
hcp
fccp
bcc
From the Dulong and Petit's law atomic weight is given by which one of the following relations?
6.41 sp. heat
6.4/sp. heat
sp. heat/6.4
sp. heat/6.4 x 2
All gases tend to show ideal behaviour
at low temperature and low pressure
at high temperature and high pressure
at high temperature and low pressure
at low temperature and high pressure
The number of atoms in 0.004 gm of magnesium is close to
36x
5 x
6.02 x
In a unit cell of cesium chloride the arrangement of cesium ions is
face centred cubic
hexagonal close packed
body centred cubic
simple cubic
Which of the following methods is used to determine the atomic weight?
Victor Meyer's method
Dumas' method
Cannizaro's method
None of these
Gases deviate from the ideal behaviour because their molecules
possess negligible volume
have forces of attraction between them
are polyatomic
are not attracted to one another
Indicate the most viscous liquid of the following
propanol-2
1.2, ethandiol
1.2,3 propentriol
ethanol
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
If all the octahedral sites in a cubic close packed arrangement () are completelyfilled with cations, the empirical formula of the compound could then be
AB
None of these
The electrical conductivity of metals is of the order of
The wt. of 2.8 litres of a gas at N.T.P. is 3.50 gms. Its V.D. is
20
28
32
14
A closed vessel contains equal number of molecules of a total pressure at 740 mm. If oxygen is removed from the system the pressure will
become half of 740 mm
remain unchanged
become 1/9 of 740 mm
become double of 740 mm
22.4 litre of any gas at N.T.P. will contain
One gram equivalent
One gram atomic weight
One gram atom
One gram molecule
Absolute zero is the temperature at which
water freezes
all gases become liquid
all substances are solid
molecular motion ceases
The number of N2 molecules present in 28 nitrogen is
2 x 10
6 x
6 x approximately
5 x approximately
The number of atoms per unit cell in bcc arrangement is
1
4
3
2
The vapour density of ozone would be
72
8
48
24