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
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
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-
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.
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
Equal masses of methane and oxygen are mixed in a empty container at 25ºC. The n fraction of the total pressure exerted by oxygen is
1/2
2/3
1/3
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
What happens to the surface tension of water when the temperature is increased ?
increases
decreases
remains same
shows irregular behavior
Which of the following expressions is correct for a CsCl unit cell with lattice parameter, a?
