Why beans were cooked earlier in pressure cooker ?
b.p increases with increasing pressure.
b.p decreases with increasing pressure.
extra pressure of pressure cooker, softens the beans.
internal energy is not lost while cooking in pressure cooker.
Which of the following expressions is correct for a CsCl unit cell with lattice parameter, a?
What is the ratio among most probable velocity, mean velocity and root mean square velocity ?
1:2:3
1: √2:√3
√2:√3: √8/π
√2: √8/π: √3
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
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
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
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 is not true in case of ideal gas?
It can not be converted into a liquid
There is no interaction between the molecules
All molecules of the gas move with same speed
At a given temperature, PV is proportional to the amount of gas.
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
The first order diffraction of X-rays from a certain set of crystal planes occur at an angle of 11.8º from the planes. If the planes are 0.281 nm apart, what is the wavelength of X-rays?
0.281 nm
0.2044 nm
0.1149 nm
0.1180 nm
