Which one of the following statements is wrong?
a. Physical adsorption of gas directly related to its critical temperature.
b. Chemical adsorption decreases regularly as the temperature is increased.
c. Adsorption is an exothermic process.
d. A solid with a rough surface is a better adsorbent than the same solid with a smooth surface.

Which of the following is not correct regarding the adsorption of a gas on the surface of solid ?

The following statement relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them :

Select the correct statements . (i) Physical adsorption is weak, multilayer, non-directional and non-specific. (ii) Chemical adsorption is strong, unilayer, directional and strong (iii) Chemical adsorption decreases with temperature (iv) Chemical adsorption is more stronger than physical adsorption

Sponetaneous adsorption of a gas on solid surface is an exothermic process because

Which of the following statement is not true about amorphous solids? (a) On heating, they may become crystalline at certain temperature. (b) They may become crystalline on keeping for long time. (c) Amorphous solids can be moulded by heating. (d) They are anisotropic in nature.

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.

The essential conditions for liquefaction of gases were discovered by Andrews in 1869 as a result of his study of pressure-volume-temperature relationship for CO_(2) . It was found that above a certain temperature, it was impossible to liquefy a gas whatever the pressure was applied. The temperature below which the gas can be liquefied by the application of pressure alone is called critical temperature (Tc). The pressure required to liquefy a gas at this temperature is called the critical pressure (Pc). The volume occupied by one mole of the substance at the critical temperature and pressure is called critical volume. Critical constants are related with van der waals' constant as follows: V_( c) = 3b, P_( c) =a/(27b^(2)), T_( c) =(8a)/(27 Rb) The values of critical volumes of four gases A, B, C and D are 0.025L, 0.312L, 0.245L and 0.432L respectively. The gas with larger molecular diameter will be :

Which of the following statements is not true? a. Both physisorption and chemisorption are exothermic. b. Physisorption occurs with increase of free energy. c. Physisorption requires low activation energy but chemisorption requires high activation energy. d. The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.

A sphere moving with a velocity v_(0) on a smooth surface suddenly enters on a rough horizontal surface as shown in Fig. State which of the following statements are true or false a. The sphere loses translational kinetic energy and gains rotational kinetic energy. b. The total energy of the sphere is conserved. c. The angular momentum of the sphere about any point OD the surface is conserved. d. The final velocity attained by the centre of mass is 2v_(0)//3 .