Nickel crystallizes in a fcc unit cell with a cell edge length of 0.3524 nm. Calculate the radius of the nickel atom.
0.1624 nm
0.1246 nm
0.2164 nm
0.1426 nm
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
A mixture of NH3(g) and N2H4(g) is placed in a sealed container at 300K. The total pressure is 0.5 atm. When the container is heated to 1200 K, both substances decompose completely according to the equations :
2NH3 (g) → N2(g) + 3H2(g)
and N2H4(g) → N2(g) + 2H2(g)
After decomposition, the total pressure at 1200 K is found to be 4.5 atm. What is the percent of N2H4(g) in the original mixture? (assuming ideal behaviour)
35%
40%
75%
25%
Which among the following statement is correct regarding the gas equation PV= nRT ?
n is the number of molecules of a gas
V denotes volume of one mole of the gas
n moles of the gas have a volume V.
P is the pressure of the gas when only one mole of the gas is present.
According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels
in a circular path
in a wavy path
in a straight line path
with an accelerated velocity
A balloon blown up with 1 mole of gas has a volume of 480 mL at 5ºC. The balloon is filled to 7/8th of its maximum capacity. Will the balloon burst at 30ºC?
Balloon will burst
Balloon will not burst
Bursting of balloon is independent of temperature
Cannot be predicted
Which of the following expressions is correct for a CsCl unit cell with lattice parameter, a?
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 happens to the surface tension of water when the temperature is increased ?
increases
decreases
remains same
shows irregular behavior
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