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
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
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
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 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.
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.
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 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
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
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
