The molar volume of KCL and NaCl are 37.46 mL and 27.94 mL respectively. What is the ratio of the unit cube edges of the crystals ?
1.296
1.116
1.341
0.950
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 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
Through the two ends of a glass tube of length 200 cm HCl gas and NH3 are allowed to enter. At what distance the white ring of ammonium chloride will first appear?
81.1 cm from HCl end
81.1 cm from NH3 end
118.9 cm from HCl end
The ring will not form
Why an ideal gas cannot be liquefied ?
its critical temperature is always above 0oC.
its molecules are relatively smaller in size.
it solidifies before becoming a liquid.
forces operating between its molecules are negligible.
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
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
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
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
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
