What happens to the surface tension of water when the temperature is increased ?
increases
decreases
remains same
shows irregular behavior
Under what condition will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1mol L-1? (R= 0.082 L atm mol-1 deg-1).
At STP
When V= 22.4L
When T= 12K
Impossible under any conditions
What is the relation between 0.50 mole H2 gas and 1.0 mole He gas at STP ?
have equal average kinetic energies
have equal molecular speeds
occupy equal volumes
have equal effusion rates
At which condition, van der Waals real gas act as an ideal gas ?
High temperature, low pressure
Low temperature, high pressure
High temperature, high pressure
Low temperature, low pressure
Which of the following gives the correct relation between internal energy and pressure of a gas per unit volume ?
P= 2/3 E
P= 3/2E
P=1/2 E
P= 2E
The given graph represents the variation of z (compressibility factor = ) versus p, for three real gases A, B and C. Identify the only incorrect statement.
For the gas A, a = 0 and its dependence on P is linear at all pressures
For the gas B, b = 0 and its dependence on P is linear at all temperatures
For the gas C, which is typical real gas for which neither a = 0 nor b = 0, by knowing the minima and the point of intersection, with Z = 1, a and b can be calculated
At high pressure, the slope is positive for all real gases
In a spinel structure, oxide ions are cubical closed packed whereas 1/8th of tetrahedral voids are occupied by A ions and 1/2 of octahedral voids are occupied by B ions. The charge present on A and B ions will be
A2+, B3+
A3+, B2+
A4+, B2-
A-1, B2-
A closed flask contains water in all its three states solid, liquid and vapour at 0oC. In this situation,what will be the average kinetic energy of water molecules ?
the greatest in all the three states
the greatest in vapour state
the greatest in the liquid state
the greatest in the solid state
If 10-4 dm3 of water is introduced into a 1.0 dm3 flask at 300 K, how many moles of water are in the vapour phase when equilibrium is established?
[ Given, vapour pressure of H2O at 300 K is 3170 Pa; R = 8.314 JK-1 mol-1 ]
5.56 x 10-3 mol
1.53 x 10-2 mol
4.46 x 10-2 mol
1.27 x 10-3 mol
What is the coordination number of carbon in diamond ?
four and its unit cell has eight carbon atoms
four and its unit cell has six carbon atoms
six and its unit cell has four carbon atoms
four and its unit cell has four carbon atoms
