10% sites of catalyst bed have adsorbed by `H_(2)` on Heating `H_(2)` gas is evloved from sites and collected at 0.03 atm and 300 K in a small vessel of `2.46 cm^(3)`. no. of sites available is `5.4 xx 10^(16) ` per `cm^(2)` and surface area is `1000 cm ^(2)` . find out the no. of suface sites occupied per molecule of `H_(2)`.
1,
2,
3,
none of these.
At 1 atm and 273 K the volume of nitrogen gas required to cover a sample of silica gel, assuming Langmuir monolayer adsorption , is found to be 1.30 cm^(3)g^(-1) of the gel. The area occupied by a nitrogen molecule is 0.16nm^(2) . Find out the no. of surface sites occupied per molecule of N_(2) . 5.568 m^(2)g^(-1) , 3.34 m^(2) g^(-1) , 1.6 m^(2) g^(-1) , none of these .
In a sample of semi conductor mobilities of electrons and holes are 24 xx 10^3 cm^2 V^-1 S^-1 and 0.2 xx 10^3 cm^2 V^-1 S^-1 respectively. If the density of electrons is 0.8 xx 10^14 cm^-3 and that of holes is 0.4 xx 10^14 cm^-3. Find the nature of semi-conductor and its conductivity.
The resistance of 0.05 M NaOH solution in a cell having length 5 cm area of cross section 10 cm2 is 5.55 xx 10^3 ohm. Calculate its molar conductance.
A solid is composed of a cylinder with hemispherical ends. If the whole length of the solid is 108 cm and the diameter of the hemispherical ends is 36 cm, find the cost of polishing the surface of the solid at the rate of 10 paise per cm^2 .
A gaseous mixture contains 4 molecules with a velocity of 6 cm sec^(-1) ,5 molecules with a velocity of 2 cm sec^(-1) and 10 molecules with a velocity of 3 cm sec^(-1) . What is the rms speed of the gas:
